PFERD 764435 Crimped End Brush, Stainless Steel Wire, 3/4" Diameter, 1/4" Shank, 0.014 Wire Size, 20000 RPM

I bought these to use with my die grinder to burnish metal scupltures I've made. What absolute garbage. They spit out all the wire in a matter of minutes and I was left with nothing but my tiny dremel to work with - which turned out to be much better and more resilient that these pieces of crud. Save your money and look for a properly branded product that has some durability.

Cleaned two valve covers and an intake manifold before it shed all its wire.