The Mirka Iridium SR 1.25" diameter PSA abrasive disc, Model Number 24-340-3U, is a premium finishing abrasive made for automotive refinishing, collision repair, and transportation manufacturing work where surface quality is the whole game. This is a premium abrasive disc designed for fine finishing and surface refinement. If you are cleaning up clearcoat, topcoat, or composite surfaces before polishing, this is the kind of disc made for that last stretch where mistakes show up fast.

What sets the Iridium SR line apart is how it focuses on the finish, not just material removal. Mirka calls out efficient silicon carbide grains and a slurry coating, and that combination is aimed at producing a scratch pattern that is easier and faster to polish out. In plain terms, it helps you get the surface where it needs to be without creating extra work later. That is a big deal in spot repair and refinishing, where the sanding step can either speed up the job or drag it out.

The 1.25-inch diameter format is built for small-area work and controlled finishing in tight sections, edges, and repair zones where a larger abrasive is overkill. The PSA backing gives the disc a simple stick-on attachment, so it stays put during use and changes out quickly when it is time to move to the next step. For detail sanding and finishing on curved panels or isolated defects, that smaller disc size gives you better control than trying to force a larger disc into a precise repair area.

Mirka also backs this abrasive with a stable, robust backing, which matters when you want the disc to perform consistently instead of loading up or getting unpredictable during fine work. In finishing applications, consistency is the difference between a clean repair and a surface that still needs more correction. That makes this abrasive disc a practical choice for users who care about repeatable results across painted panels, clearcoats, and composite parts.

As part of the Mirka finishing system, the Mirka Iridium SR 1.25" diameter PSA abrasive disc is intended for use with Mirka ergonomic cordless sanders including the Mirka AOS130-B and AROS150-B. That makes it a good fit for shops already running Mirka spot repair tools and looking for an abrasive that matches the tool's size and purpose. When the sander, backing pad, and abrasive are all built around fine-detail work, you get better control and a cleaner workflow.

Who should buy it? Auto body techs, paint correction pros, collision repair shops, and manufacturing users doing final finishing on painted or composite surfaces will get the most out of it. If your work is mostly heavy stock removal, this is not the disc for that. If your work is refining a surface so it is ready for the next finishing step, this is exactly the right lane.

Mirka Iridium SR 1.25" Diameter PSA Abrasive Disc for Finish Work That Actually Needs to Look Right

This is a smart pick for detail finishing because it is built to refine the surface cleanly and keep polishing time under control.

• Who it's for: Auto body techs, collision repair shops, and finishing pros doing spot repair, clearcoat refinement, or composite finishing.
• Why it stands out: The small 1.25-inch size gives you control, while the silicon carbide and slurry-coated design are aimed at a scratch pattern that is easier to polish out.
• Worth knowing: This is a finishing abrasive disc, not a heavy removal product. If your goal is final surface quality, it makes sense. If you still need to level material aggressively, start earlier in the process.

• What is this product used for? It is used for the finest finishing stages in automotive refinishing, collision repair, and transportation vehicle manufacturing.
• What materials is it designed to sand? It is designed for clearcoats, topcoats, and composites processing.
• What type of backing does it use? It uses a pressure sensitive adhesive, or PSA, backing for direct attachment to the backing pad.
• Which Mirka sanders is it intended to work with? Mirka lists the cordless AOS130-B and AROS150-B as compatible tools for this abrasive disc.