Mirka Iridium 5 PSA 400, PK100 is a pack of 5 inch PSA sanding discs in 400 grit for fine sanding and finishing work. This is a sanding disc designed for surface preparation and refinement. Model Number: 24-314-400. If you need a shop-stock abrasive for lighter sanding steps where consistency matters, this pack is set up for exactly that.

The 400 grit rating puts this disc into a finer sanding range, which makes it a practical choice when the job calls for smoothing, blending, or preparing a surface for the next finishing step. That matters because once you get into the finer grits, scratch pattern control becomes more important than raw stock removal. In plain terms, this is the kind of abrasive you reach for when you are trying to clean up a surface rather than aggressively cut it down.

The 5 inch disc size is one of the most common formats in sanding, so it works well for users who want broad availability and a familiar footprint. A 5 inch disc gives you enough face area to work efficiently while still staying manageable on smaller parts and detail-focused sanding tasks. For a lot of users, that size is the sweet spot between productivity and control.

This Mirka abrasive uses a PSA format, which is important if your setup is built around pressure-sensitive adhesive discs rather than hook and loop discs. That attachment style matters because it determines what backing pad or sanding setup the disc is intended to work with. If you already run PSA discs, this is the right style to keep your workflow consistent.

Pack quantity matters more than people think with consumables, and this product comes in a box of 100 discs. That makes it a smarter buy for anyone sanding regularly, whether that is in a cabinet shop, body shop, maintenance department, or a serious home workshop. Instead of buying small sleeves and running short mid-job, you have enough discs on hand for repeat use.

Mirka is well known for abrasives, and this Finland-made disc pack is aimed at users who care about repeatable results, not just grabbing the cheapest paper on the shelf. The right buyer here is the one who already knows they need a 5 inch PSA sanding disc in 400 grit and wants a bulk quantity from a trusted abrasive brand. If that is your setup, this is a straightforward, no-nonsense consumable that fits the job.

Mirka Iridium 5 PSA 400, PK100 is the smart refill for fine sanding work

If your setup already uses 5 inch PSA discs, this is the kind of bulk abrasive buy that keeps the bench moving without overthinking it.

• Who it's for: Pros and serious shop users who need 5 inch PSA sanding discs in a finer 400 grit for repeat finishing and prep work.
• Why it stands out: You are getting Mirka Iridium discs in a useful fine grit, a common 5 inch size, and a full 100-pack instead of a small refill.
• Worth knowing: This is a PSA disc, so make sure your sanding setup is meant for adhesive-backed discs and not hook and loop.

• What grit are these discs? These Mirka Iridium discs are 400 grit.
• What size are the discs? The disc diameter is 5 inches.
• How many discs come in the pack? This package includes 100 sanding discs.
• What attachment style does this product use? It uses a PSA backing format.