- The hardest mineral is a must for finishing materials harder than 60 Rockwell C such as thermal sprayed tungsten carbide, chrome oxide, glass, stone, chilled iron and forged steel.
- For use on Dynabrade’s Superfinisher to achieve predictable, consistent and repeatable finishes on a variety of materials.

3M 30137, Heavy Duty Canvas Wheel Masker, 20 inch, 7100145359, 4 per pack 
