3" x 4" 6-Hole Sanding Sheets for SurfPrep / Uneeda / Mirka
10 of each grit - 80, 120, 150, 180, and 220
In stock
Serious Grit's 3" x 4" 6 hole hook and loop sanding sheets are the perfect match for your 3x4 detail sander.
With their high quality film construction, durable hook and loop backing, and proprietary zinc stearate anti-clog coating, these discs won't let you down in your shop.
Featuring a range of grits from 40 - 800 and an variety box option containing 80-220, Serious Grit will help you get the job done.
This has been one of our most requested sizes from our loyal fan base and we're thrilled to finally offer them for sale.
Each box contains 50 sheets, except for the 40 grit and 60 grit boxes, which contain 25 discs each.
Mixed grit box includes 10 sheets of each - 80, 120, 150, 180, and 220 grit.
- FITS SURFPREP, UNEEDA, & MIRKA - Serious Grit 3" x 4" 6-Hole 40 grit hook & loop rectangle sanding sheets are compatible with the Surfprep 3x4 Electric Ray, Surfprep Storm, Uneeda Ekasand, Mirka DEOS 343, and any other 3" x 4" hook and loop detail sander. These sanding sheets are ideal for sanding all surfaces, including wood, metal, drywall, epoxy, and painted surfaces.
- HOOK & LOOP-BACKED FILM SHEETS – Our sanding sheets are constructed with a heavy-duty polyester film backing material between the aluminum oxide abrasive grain and the hook and loop backing. This premium material creates a stronger disc, with more effective heat dissipation, and a better finish. These wet/dry discs are perfect for woodworking, auto body work including paint removal and wet sanding, and more.
- MORE DURABLE – Our sanding sheets are made with polyester film construction which makes them nearly impossible to tear. No more frayed or torn edges when sanding around corners.
- LESS CLOGGING – Our proprietary heat-treated zinc stearate anti-clog coating sheds dust before it has a chance to clog up your disc, making these discs virtually dust free when paired with a dust extractor or vacuum system.
- SMOOTHER FINISH – The film construction creates a flatter, stronger disc that produces a better finish vs paper, mesh, or net sanding discs. With our anti-clog coating, the entire surface area of the disc stays effective longer, which improves cutting power and leads to a more consistent swirl-free finish.
Key Features
Compatible Sanders
Shipping & Returns
Fits SurfPrep, Mirka, Uneeda 3x4
Film-Backed Durability
Anti-Clog Coating
Our Secret Formula
We'll let you in on some secrets - here are 3 of the ingredients that make our discs so famous.
Film Construction
What does that mean? Well most discs adhere the abrasive grain to a backing made of paper. Ours use a polyester film backing which is usually reserved for the highest end professional discs due to the costs involved but we bring it to everyone.
Anti-Clog Coating
Our proprietary heat treated zinc stearate coating resists clogging so the abrasive surface stays cleaner and cuts more effectively for longer - especially on soft materials like paint, primer, softwoods, and drywall compound.
Premium Hook & Loop
We use an ultra-premium 70% nylon material for our hook & loop backing. This ensures a secure hold to your sander pad, reducing slippage and preventing discs from flying off during use - even under heavy pressure or at high RPMs.
See The Film Difference
What makes film-backed sanding discs better?
*Actual photos below with equal time sanding on each disc.
Made To Last
Say goodbye to torn edges. Our discs are backed with a flexible polyester film that resists tearing, cracking, and edge breakdown—especially around hole patterns where paper often fails. That means fewer wasted discs and more time sanding.
Flawless Finish
The polyester film backing is perfectly flat and won’t wrinkle or deform under pressure. That creates a consistent surface that holds abrasive grain evenly across the disc—so you get a uniform scratch pattern and a smoother final finish with less effort.
Wet/Dry Ready
Paper backing swells and breaks down when exposed to water, but film stays stable. Our discs are built with a waterproof film layer that won’t warp, even in wet sanding or high-humidity environments—so you can sand confidently in any environment.
