Mirka Trim-Kut Grinding Disc model 63-300-024 is a 3 inch coarse abrasive disc for quick material removal across metal, wood, fiberglass, and composite surfaces. This is a grinding disc designed for aggressive grinding and surface cleanup. If you need a compact disc for smaller contact areas and quick-change setups, this one is built for that kind of work.

The key spec here is the P24 grit. That is a very coarse grade, so this disc is aimed at stock removal, stripping, edge cleanup, and knocking down welds or rough surfaces rather than finish sanding. On the job, that means less time babying the surface when the goal is to remove material fast and move on to the next step.

Mirka lists this Trim-Kut disc for use on tools with quick-change mandrels and adapters, which matters if you want fast disc swaps without dealing with a larger backing system. The 3 inch diameter gives you more control than a larger grinding wheel when working on smaller parts, tighter areas, or uneven surfaces where a big disc would feel clumsy.

The abrasive material is premium aluminum oxide on a coated construction with a durable polymer-backed design. In practical terms, that combination is about balancing cut speed with disc life. It is a good fit for users who need one abrasive style that can move between mild steel, stainless steel, aluminum, hardwood, softwood, fiberglass, and other common shop materials.

The disc also uses a 0.31 inch center hole and a 1.25 mm thickness. Those are the details that affect fit and feel. The slim profile helps the disc stay practical for controlled grinding, while the center hole size matters when matching the disc to the correct mandrel or adapter setup.

This pack includes 20 discs, so it makes sense for users who burn through coarse abrasives regularly. That is especially useful in fabrication, bodywork, maintenance, repair, and general shop cleanup where coarse discs are consumables, not once-in-a-while accessories.

Who should buy it? This Mirka grinding disc is a solid choice for metalworking, fabrication, woodworking, composite work, and general repair jobs where fast removal matters more than surface finish. If your work starts rough and you need to get material down quickly before moving to finer abrasives, this is the right kind of disc. If you are looking for finish prep, though, go finer than P24.

Small Disc, Big Appetite for Rough Work

The Mirka Trim-Kut Grinding Disc is the kind of abrasive you grab when the job is ugly and you need to make progress fast.

• Who it's for: Anyone doing fabrication, repair, bodywork, woodworking, or composite cleanup with a quick-change setup.
• Why it stands out: The 3 inch size gives you better control than a larger wheel, and the coarse P24 aluminum oxide cut is made for real material removal.
• Worth knowing: This is a roughing disc, plain and simple. If your end goal is a finished surface, plan on following it with finer abrasives.

• What tools is this disc made for? It is designed for tools that use quick-change mandrels and adapters.
• What materials can it be used on? Mirka lists it for metal, wood, fiberglass, and composites, including steel, stainless steel, aluminum, plastics, and hardwoods.
• Is this a finishing disc? No. The P24 grit is a coarse grade meant for aggressive grinding and fast material removal.
• What is the disc diameter? The disc diameter is 3 inches.