The Mirka Iridium 5-Inch Sandpaper Discs, Model 24-5MH-040, are hook and loop sanding discs built for aggressive surface prep and material removal. This is a sanding disc designed for heavy stock removal, stripping, and early-stage surface preparation. With a 5 inch diameter, 40 grit abrasive, and a 50-count pack, this setup makes sense for body shops, woodworkers, metal fabricators, and anyone burning through coarse discs on real work.

What matters here is the cut. A 40 grit disc is not a finish sanding option. It is for knocking down filler, stripping coatings, leveling rough surfaces, and getting a workpiece ready for the next steps. If you need a disc that removes material quickly instead of polishing it slowly, this grit range is where you start.

Mirka uses a ceramic aluminum oxide abrasive on a paper backing, which is a practical combination for users who want fast cutting with decent disc life. The ceramic content helps the disc stay productive under heavier sanding loads, while the aluminum oxide component keeps it versatile across mixed materials. That matters when you move between wood, metal, plastic, and automotive repair work instead of sanding one material all day.

Another useful part of this Mirka sanding disc setup is the dust-repellent, clog-resistant design. Coarse discs do a lot of dirty work, and once they load up, they stop cutting well and start wasting time. The coating is there to help keep debris from packing into the abrasive surface too quickly, which can mean a cleaner cut and fewer disc changes during long prep jobs.

The multi-hole layout is also important. These Mirka Iridium 5-Inch Sandpaper Discs are made to support dust extraction when used on a compatible disc sander and pad. Better dust pull means less mess on the work surface, less airborne dust, and a more consistent sanding pattern because the abrasive stays clearer. On automotive panels, wood surfaces, and painted parts, that can make a real difference in workflow.

Fitment is straightforward. These are 5 inch hook and loop discs intended for disc sanders that accept this size and attachment style. That makes them easy to swap out on the fly, especially when you are stepping through multiple grits in a sanding sequence. They are also sold in a 50-pack, which is the right move for shop use where consumables disappear fast.

These discs are a strong fit for automotive body sanding, woodworking surface prep, metal sanding, plastic sanding, and general paint prep. They are especially useful for users who need an aggressive first pass before refining the surface with medium and fine grits. If your work starts with removing defects, old finish, filler high spots, or rough stock, this is the kind of disc that earns its keep quickly.

Mirka Iridium 5-Inch Sandpaper Discs are the kind of coarse discs you buy when speed matters

This pack is built for users who need a disc that actually removes material instead of just polishing the problem.

• Who it's for: Body shop techs, woodworkers, metalworkers, remodelers, and serious DIY users doing aggressive prep work.
• Why it stands out: The ceramic aluminum oxide abrasive, clog-resistant design, and multi-hole dust extraction setup make it a smart choice for high-use sanding jobs.
• Worth knowing: At 40 grit, this is an early-stage sanding disc. It is meant for removal and prep, so plan on following it with finer grits if you need a finish-ready surface.

• What type of sander do these discs fit? They are designed for disc sanders that use 5 inch hook and loop sanding discs.
• What materials can these sanding discs be used on? Source data lists automotive surfaces, wood, metal, plastic, and wall or body sanding applications.
• Is this a finishing grit? No. This is 40 grit extra coarse, which is intended for aggressive material removal and surface prep.
• Do these discs support dust extraction? Yes. The multi-hole design is intended to improve dust removal when paired with a compatible sander and backing pad.