The Mirka 23-332-320 PSA Disc is a 5 inch P320 sanding disc sold in a 100-count box. This is a PSA sanding disc designed for fine sanding, finishing, and light material removal on wood, metal, and composite surfaces. Model Number: 23-332-320. If you need a finer grit disc for prep before final finishing steps, this is the kind of disc you keep on hand.

What matters here is the combination of P320 grit, aluminum oxide abrasive, and Mirka's Bulldog Gold-23 series construction. P320 is a fine grit, so it is better suited to smoothing, blending, and finish prep than aggressive stock removal. On the job, that means less time fighting deep scratches and less cleanup before coatings, paint, or the next sanding step.

The abrasive is a coated aluminum oxide grain on a paper backing. That gives you a familiar balance of cut, flexibility, and cost for general sanding work. For shops and contractors doing repeat prep work, paper-backed coated discs are a practical choice because they are easy to handle, easy to change, and well suited to controlled finish sanding.

This Mirka PSA disc uses a pressure sensitive adhesive backing instead of a hook and loop attachment. That matters if you prefer a firm, flat hold on the backup pad and want a simple peel-and-stick setup. PSA discs are a solid fit for users already set up with PSA sanding tools or pads and looking for a reliable fine-grit disc in bulk.

This specific version has a no-hole pattern, so it is intended for setups that do not require a vacuum hole layout through the disc. That makes it a straightforward option for sanding applications where dust extraction through the disc is not part of the setup. If your sander or pad requires hole alignment for dust collection, that is the detail to check before you buy.

The 5 inch diameter is one of the most common disc sizes in sanding, which keeps this Mirka abrasive useful across a wide range of finishing and prep work. Based on the provided product data, it is suitable for use on wood, metal, and composites. That makes it a good fit for body shop prep, woodworking finish sanding, general fabrication cleanup, and other jobs where a finer abrasive step helps dial in the surface.

Who should buy it? This pack makes the most sense for painters, woodworkers, auto body users, finish carpenters, and production shops that go through fine sanding discs regularly. If you already run 5 inch PSA sanding equipment and need a fine grit Mirka disc in a box quantity that makes sense for real work, the Mirka 23-332-320 PSA Disc is the practical choice.

Mirka 23-332-320 PSA Disc for clean finish prep

This is a smart buy for anyone running 5 inch PSA sanding gear and needing a fine grit disc in real shop quantity, not just a handful of replacements.

• Who it's for: Woodworkers, painters, body shop users, and finish-focused trades working on wood, metal, or composites.
• Why it stands out: You get a 5 inch PSA disc with P320 aluminum oxide abrasive in a 100-pack, which is exactly the kind of setup that makes sense for repeat finish sanding work.
• Worth knowing: This is a no-hole disc with PSA backing, so it is only the right pick if your pad and sanding setup are built for that style.

• What grit is this disc? This Mirka disc is P320 grit, which is suited to fine sanding and finish prep.
• What materials can it be used on? Based on the provided product data, it is suitable for wood, metal, and composite materials.
• Does this disc have vacuum holes? No. The listed vacuum hole design is no hole.
• What type of backing does it use? It uses a pressure sensitive adhesive backing, also called PSA.