MOUNT-IT! Under Desk Pencil Drawer (MI-7148) Review: Hands-On With a 16-Inch-Deep Slide-Out Tray

Most modern desks hand you a beautiful flat slab and nowhere to put anything. Pens, notepads, sticky notes, and cables end up spread across the surface you were trying to keep clear. That is the exact problem the MOUNT-IT! Under Desk Pencil Drawer is built to solve.

This is a slide-out tray that mounts to the underside of a desk you already own. I spent time with the MI-7148, sold as the MOUNT-IT! Large Under Desk Pencil Drawer, checking its build, its slide action, and the clearance it demands before you commit a drill to your desktop. You can watch the slide test and the fit measurements in the YouTube video above.

What follows is a hands-on review rather than a rewrite of the product description. The short version: the hardware is a clear step above the flimsy plastic under desk trays it competes with, and the fit requirements are stricter than most buyers expect.

MOUNT-IT! Under Desk Pencil Drawer Specifications and Desk Fit

The tray measures 21.25 inches wide and 16.25 inches deep, with a mounted footprint of 22.75 inches wide and a slim 1.4 inches tall. Inside are five compartments: one large open bay at the back for paper and notepads, and a divided front row for pens, pencils, clips, and tape. That layout is what separates a real drawer from a shallow desk tray.

Before you buy anything, measure. MOUNT-IT! asks for a desktop over 1 inch thick and a minimum under-desk space of 23 inches wide by 16.25 inches deep. The rails then set to an adjustable extension anywhere between 16.25 and 28 inches to match how deep your desk actually is.

The whole item is black, with a metal frame carrying a reinforced plastic tray, and it ships with no assembly required. At $51.99 on Amazon as of September 1, 2026, it lands in the middle of the under desk storage market. Cheaper trays exist, but most of them ride on plastic rails.

What I Liked About This Under Desk Pencil Drawer

Ball Bearing Slides That Stay Smooth and Quiet

The slide mechanism is the feature that earns this drawer its price. These are ball bearing rails rather than the plastic tracks used on budget under desk trays, which get sticky and catch after a few months of daily use.

Pulling the tray out is quiet and even across the full travel, with no jamming at the halfway point. One Amazon buyer summed it up as “the drawer action is very smooth and quiet,” and my own testing matched that. Budget desk gear is not always a downgrade though, and the YSAGi desk mat is one accessory where the cheap option holds up across more than 43,000 reviews.

A Metal Frame and Reinforced Tray, Not Flimsy Plastic

The frame is metal and the tray is reinforced plastic, which is a meaningful step up from the all-plastic drawers in this price band. Another buyer noted it “comes with quality rails and a decent fit/finish,” and that is a fair read.

It does not flex or creak when you load it up. The tray is still plastic, so this is sturdy rather than indestructible.

Five Compartments That Keep Office Supplies Sorted

You get five compartments, not one open box. The large rear bay swallows letter paper and a notepad, while the divided front row sorts pens, pencils, paper clips, binder clips, and a tape dispenser into their own slots.

Grooves in the front channel stop pens from rolling every time the drawer moves. If you keep drawing or sketching supplies on your desk, they sort into the same front row without rattling around.

An Adjustable 16.25 to 28 Inch Extension for Odd Desks

The mounting rails adjust from 16.25 inches out to 28 inches, so you set the drawer’s depth to match your desktop rather than hoping a fixed size lines up. That range is the single biggest advantage this model has over its smaller sibling.

It also means you can pull the drawer far enough forward to get easy access to the back bay without crouching. On a deep desk, that matters more than it sounds.

All the Mounting Hardware Is in the Box Already

Every bracket and screw you need ships in the box, along with a product-specific installation guide. The mount is a two-step process: attach the rails to the drawer, then attach the brackets to the underside of your desk.

There is no assembly required beyond that, and you will not need a hardware store run mid-project. A screwdriver and a drill for pilot holes cover it.

It Clears Desktop Clutter Without Eating Legroom

At 1.4 inches tall, the drawer sits close enough to the underside of the desk that it stays out of your knees. That low profile is what makes it workable on a standing desk, where every inch of clearance is already spoken for.

MOUNT-IT! builds this to work with sit-stand frames without interfering with the desk’s travel, and one buyer fitted it to an 80-by-30-inch C-frame Uplift desk with the front edge sitting a quarter inch back from the desktop edge. Another simply wrote “Perfect for my Stand-up desk!” The result is added storage space without surrendering any floor space. If you are still choosing the desk itself, the Mount-It Rolling Standing Desk applies the same brand’s thinking to a four tier mobile workstation sized for taller users.

What Needs Improvement: Installation, Fit, and Finish

It Screws Into Your Desk Instead of Clamping On

This drawer mounts with screws into the underside of your desktop. There is no clamp option and no adhesive, so you are committing permanent holes to your desk the first time you install it.

Screws hold far better than a clamp under load, so I read this as a trade rather than a flaw. It does rule the drawer out if you rent your desk, plan to resell it, or own a glass top.

The included screws are also sized for the 1-inch-plus desktop MOUNT-IT! specifies. Hands-on testing found they sit flush on a 1.25-inch top but can poke through a thinner 0.75-inch bamboo surface, so a thin desk means sourcing shorter screws yourself.

Exposed Slide Edges Sit Right at Knee Height

The metal slide track is left exposed at the front of the tray rather than shielded by a flared lip. The only critical Amazon review on the listing reports exactly what that leads to: “the track it slides on has super sharp corners and being under the desk, I cut myself if I’m not paying attention moving my legs under my desk.”

A four-star buyer raised the same design point independently, noting the metal is exposed at the front so “you could potentially hit yourself or snag your pants.” Two people flagging the same edge is enough for me to call it a genuine finish problem rather than a one-off.

A Crossbar or Keyboard Tray Can Block the Fit Entirely

That 23-by-16.25-inch minimum footprint is not a suggestion. A center support bar, a desk crossbar, or an existing keyboard tray will block the mount, and this is the most common reason these drawers get returned.

T-frame standing desks are the usual casualty, since the crossbar sits where the drawer wants to go. Measure the flat run under your desktop before ordering, not after. When a crossbar rules out mounting anything to the underside, the Mount-It! Slim 3-Drawer Rolling Under-Desk File Cabinet rolls into the same space with no drilling and a central lock.

Reports of Shipping Damage and Missing Brackets

Shipping damage comes up repeatedly across MOUNT-IT!‘s own product page and other retail listings, sometimes with mounting brackets missing from the box. One Amazon buyer admitted being nervous to order “due to all of reviews mentioning damage,” though their unit arrived fine.

MOUNT-IT! appears to replace damaged units quickly when contacted. Two smaller gripes round this out: the drawer has no detent to click it shut, and it cannot be lifted off its glides without unmounting the whole assembly.

MOUNT-IT! calls the installation easy, and the two-step sequence is simple enough on paper. Doing it overhead on a desk that is already standing in place is the awkward part, and buyers asked for measurements, drill bit sizes, and a paper template the instructions leave out. A second pair of hands helps more than any of that.

How This Desk Pencil Drawer Compares to Other Under Desk Trays

The closest comparison is inside MOUNT-IT!‘s own lineup. The MI-7144 is the standard model at 21.2 inches wide but only 5.6 inches deep with a fixed 6.8-inch extension, so it holds pens and little else. The MI-7148 reviewed here trades a larger mounting footprint for a 16.25-inch depth that actually swallows paper.

MOUNT-IT! also sells a shallow under desk drawer with two compartments that rates 4.5 out of 5 on its own site. That one is the answer if a crossbar rules out the large pencil drawer, though you give up the divided storage organizer layout and most of the usable storage space.

For anyone who cannot drill, the VIVO MOUNT-KB05-4DW clamps on instead and comes in white as well as black. The catch is a 1.25-inch maximum desk thickness, no compatibility with beveled edges, and buyer reports of mixed slide smoothness over time.

At the other end, the Uprite Ergo Ideal-Fit pen drawer is built from commercial-grade steel with six compartments, a lock and key, and soft close. It is engineered specifically to clear standing desk crossbars, but it is a commercial fixture priced well above this one. The Fellowes 9140303 is worth naming too, though it is a keyboard drawer rather than supply storage.

Where to Shop for This Product

Amazon is the cheapest route I found at $51.99 as of September 1, 2026, where the drawer holds 4.4 stars across 714 ratings. Walmart lists the same model at 4.1 stars across 37 ratings, with reviewers there highlighting ease of setup and sturdiness.

MOUNT-IT!‘s own store is the outlier at 3.8 stars with 75% of reviewers recommending it, and the shipping damage complaints are concentrated there. Best Buy carries it as well, and industrial suppliers list it as high as $78.29, so the Amazon price is a genuine saving rather than a headline.

If you are the kind of buyer who would otherwise pick up a drawer organizer at Office Depot, note that the fit requirements matter far more here than the brand does. A tray you can actually mount beats a better tray you cannot. Talk of the House named this model Best Wide Format in its under desk drawer roundup for that reason.

Final Verdict on the MOUNT-IT! Under Desk Pencil Drawer

This is a straightforward way to add a real drawer to a desk that never came with one. The metal frame, the ball bearing slides, and the five-compartment layout all land above what the price suggests, and the adjustable extension makes it fit desks that defeat fixed-size trays.

I rate it 4.1 out of 5. The deductions are all about installation and finish rather than function: the screw-in mount is permanent, the exposed slide edge sits at knee height, and the 23-by-16.25-inch clearance requirement will disqualify plenty of T-frame standing desks before you get to the fun part.

If you own a plain slab desk, a sit-stand frame with a clear underside, or a small one-desk office, this earns its spot. Measure first, install it with a second pair of hands, and keep it loaded with light office supplies rather than treating it as heavy storage. Do that and it disappears into the desk exactly as it should.