SOKOSEY 200Pcs Nylon Hole Plug Set (9 Sizes: 1", 7/8", 3/4", 5/8", 1/2", 3/8", 5/16", 1/4", 1/5") - Plastic Hole Plugs, Assorted Sizes, Precision Fit End Caps for Cabinets & Furniture

Why I keep a plug assortment in the shop

A drawer full of hole plugs has saved me more times than I can count. From covering unused bumper sensor cutouts to tidying cabinet knockouts and hiding errant pilot holes, a simple push-in cap often turns a small eyesore into a non-issue. The SOKOSEY plug set has been my latest go-to for that job: a 200-piece, black nylon assortment covering nine sizes from 5 mm (about 1/5") up to 1". After a few weeks of projects across furniture, automotive, and light electrical enclosures, here’s how it performed.

What you get

The range is practical. The kit includes a lot of the smaller diameters (where I burn through the most) and fewer of the big ones: 50 of the 5 mm, 40 of the 6 mm (1/4"), then stepping up through 8 mm (5/16"), 10 mm (3/8"), 13 mm (1/2"), 16 mm (5/8"), 19 mm (3/4"), 22 mm (7/8"), and 25 mm (1"). That spread covers most common drill sizes in both imperial and metric, so I’m rarely hunting for a “close enough” fit.

Each plug has the size molded into the head. It’s a small detail, but it meant I could grab the right one without sorting by eye or caliper every time. The heads have a subtle frosted texture that improves grip, and the shanks use a barbed, auto-lock profile that snaps into place without tools. The nylon itself is advertised as anti-aging and flame resistant; I can’t verify the full extent of those claims, but it feels like a good, dense engineering-grade nylon rather than brittle commodity plastic.

Fit, finish, and ergonomics

The fit quality is consistent across sizes. Mold lines are minimal, edges are clean, and the heads sit uniformly flush when the hole and panel thickness are appropriate. The “arc” profile on the head isn’t just aesthetic—it offers a slight crown that helps the plug compress and absorb light taps during installation without marring.

Installing is genuinely tool-free most of the time. For holes on the tighter side of the nominal size, I found thumb pressure enough; for oversized or slightly out-of-round holes, a wood block and a gentle tap seat the plug cleanly. The frosted head texture makes it easy to pull a plug back out with fingernails; for stubborn fits, a plastic trim tool or thin flat driver under the head pops them free without damage.

Real-world uses I tried

• Furniture and cabinetry: I used several 6 mm and 8 mm plugs to cover shelf-pin holes and a few mis-drilled pilot holes. The black heads look deliberate on dark melamine and painted cabinets. On raw hardwood, a color-matched wood plug will always look more “built-in,” but for shop cabinets and utility furniture these nylon caps are tidy and durable.

• Vehicle trim and bumpers: The 19–25 mm sizes are ideal for covering unused sensor and accessory ports. In an aftermarket bumper with several unused holes, the 22 mm and 25 mm plugs snapped in and held through a power wash without budging. They’re not a substitute for a gasketed, rated plug if you need true ingress protection, but they kept out spray and road grit in my testing.

• Small enclosures: On a few plastic and sheet-metal boxes, the 10–13 mm plugs made quick work of unused knockouts. They noticeably reduced dust intrusion in a fan housing when paired with a foam strip, and the heads sat flush enough not to interfere with mounting in tight spaces.

Sealing and durability

These plugs aren’t marketed with an IP rating, so I treated sealing as “dust and splash resistant” rather than waterproof. In practice, they did a good job keeping out sawdust and incidental spray. The auto-lock barbs create surprising friction, especially in clean, properly sized holes, and the head’s slight crown helps shed droplets rather than pooling.

I left several installed outdoors for a few weeks on a piece of test scrap. There was no immediate chalking or brittleness, which aligns with nylon’s typical performance. Long-term UV can still age most plastics, so I’d keep an eye on exposed installations over seasons. Heat handling was fine near a motor housing that warms during use; I didn’t see softening or deformation under normal service temperatures.

Sizing guidance and selection tips

Choosing the right size is as simple as matching the nominal hole diameter, but a few habits improve outcomes:

• Measure the actual hole with calipers if you can. For rough or painted holes, clean the edges first.

• If your hole is slightly oversized or out-of-round, try the next size up or plan to dress the hole with a step bit to a clean, standard size.

• These push-in profiles grip best in a hole that has some depth. In very shallow holes (for example, a blind recess only a couple of millimeters deep), the shank can bottom out before the head seats flush. In those cases, look for low-profile or flush-mount caps designed for thin panels.

• For removal without scarring, pry gently at two points opposite each other; nylon rebounds well if you avoid gouging the head.

What surprised me

The engraved size markings ended up being more useful than I expected. On most assortments, I’m guessing or mic’ing a plug and then trying a few. Here, the size-to-hole fit was predictable. The number of small sizes also matched how I actually use these—smalls disappear quickly on shop projects, while 22–25 mm plugs are an occasional need. I appreciated not running out of the 5–8 mm range.

The other pleasant detail is the head texture. A glossy plug can look cheap and slippery; the frosted finish hides fingerprints and blends in better with matte plastics and powder-coated panels.

Limitations and what they’re not

• Not a gasketed seal: For liquid-tight requirements or outdoor enclosures that need true ingress protection, use a rated, gasketed plug. These are great for dust, debris, and incidental splash—not for submersion or pressurized wash-down.

• Panel thickness sensitivities: As noted, a very shallow hole or very thin panel can make it hard to fully seat the head. If your panel is thinner than the retention barb’s depth, consider plugs specifically designed for thin sheet.

• Color options: The entire set is black. That’s the most versatile color in my shop, but if you need white, gray, or color-matched caps, you’ll have to paint or source separate packs.

Value

A 200-piece assortment will feel excessive if you only need a single plug. But if you maintain a home shop, build or repair furniture, or do automotive/electronics odds and ends, having a well-curated spread of sizes is exactly what prevents a trip to the store for a $5 pack of the wrong size. Given the consistency, the count where it matters (small sizes), and the finish quality, the pricing is easy to justify as a staple consumable.

Who will benefit most

• DIYers and woodworkers who want clean covers for pilot-hole mistakes, shelf-pin holes, and knockouts.

• Automotive hobbyists needing tidy covers for unused sensor ports, bumper holes, and interior trim openings.

• Light electrical and electronics tinkerers who work with small enclosures and want an easy dust block.

If your work leans toward thin sheet metal with very shallow recesses, look for a flush, low-profile style instead—or plan to back up the hole with a washer to give the barbs something to grab.

Recommendation

I recommend the SOKOSEY plug set. It hits the right notes: a useful size spread with smart counts, clean molding, engraved markings that speed selection, and a push-in design that holds securely without tools. Within its intended scope—tidy covers and light sealing for cabinetry, furniture, automotive trim, and small enclosures—it performs exactly as I want. Just be mindful of shallow holes and liquid-tight needs; for those, choose a different style. For everyone else, this is the kind of inexpensive, reliable assortment that earns its place in the shop.