- Excellent cut rate and performance
- E-weight paper backing is highly durable and withstands wear, pressure and damage
- Easy and reusable hook-and-loop system
- Available in a variety of sizes and grades.
3M Hookit Blue Abrasive Disc 521U is a paper-backed abrasive disc with excellent performance and cut. It is available in a range of grades and sizes.
Use the 3M Hookit Blue Abrasive Disc 521U for sanding on collision repair substrates like paint, primer, metal and composites. It is a fast-cutting paper-backed disc with durable E-weight paper backing for excellent cut and long lasting performance. The Hookit™ system features hook-and-loop attachment for easy, reusable application.

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