The Mirka 23-332-400 5-Inch 400 Grit Gold PSA Disc is a 5-inch pressure-sensitive adhesive sanding disc built for fine finishing work and controlled surface preparation. This is a sanding disc designed for finish sanding on wood, metal, plastic, fiberglass, and refinishing surfaces. Model Number: 23-332-400.

What matters here is the combination of a fine 400 grit and Mirka's Gold abrasive line. A 400-grit disc is not your first step when you need to remove a lot of material. It is the kind of disc you reach for when the surface is already close and you need to refine it, clean up the scratch pattern, or get a piece ready for the next coating or finishing stage.

The abrasive material is aluminum oxide, which is a proven choice for general-purpose sanding because it cuts well and holds up under regular shop use. Mirka also calls out a semi-open coat and stearate coating in the product data. In plain terms, that means the disc is built to resist clogging and loading better than a basic paper disc, which helps the cut stay more consistent and keeps you from burning through consumables too quickly.

This disc uses a PSA backing, so it is meant for tools and backup pads that accept pressure-sensitive adhesive discs. That gives you a firm, direct attachment that many finishers like for flat, controlled sanding. The listed format is no holes, so it is geared toward applications and pad setups where a hole pattern is not required.

Mirka positions this abrasive as an all-around sanding material, and the use cases in the source data back that up. It is suited for automotive refinishing, wood processing, metal processing, marine work, and vehicle manufacturing. That makes it a practical consumable for body shops, cabinet shops, fabrication work, and serious DIY users who care about a predictable finish instead of just getting through the job.

If you already use 5-inch PSA sanding discs and need a fine grit for finish work, this is the kind of consumable that makes sense to keep on the shelf. It is especially useful for users who want a durable abrasive, a consistent scratch pattern, and the simplicity of PSA attachment in a 100-count box.

• What type of disc is this? This is a 5-inch PSA sanding disc, which means it uses a pressure-sensitive adhesive backing rather than a hook and loop attachment.
• What grit is it? It is a 400-grit disc intended for fine sanding and finish surface preparation.
• Does this disc have dust extraction holes? No. The source data and product naming indicate this is a no-hole disc.
• What materials is it suited for? The source data lists wood, metal, plastic, fiberglass, automotive refinishing, marine work, and vehicle manufacturing applications.

Mirka 23-332-400 5-Inch 400 Grit Gold PSA Disc for Shops That Care About Finish Quality

This is a smart buy for anyone who burns through fine-grit discs and needs a dependable finishing abrasive that cuts clean without loading up too fast.

• Who it's for: Body shops, woodworkers, marine refinishers, metal fabricators, and serious DIY users doing finish sanding with a 5-inch PSA setup.
• Why it stands out: You get Mirka Gold durability, aluminum oxide abrasive, anti-loading stearate coating, and a fine 400 grit in a 100-count box.
• Worth knowing: This is a no-hole PSA disc, so make sure your pad is set up for adhesive-backed discs and that you do not need a vacuum hole pattern for the job.