I compared a Pferd 40 grit flap disc made for stainless steel to a
Cubitron II flap disc made by 3M. The Cubitron cuts at least 3 times
faster than the Pferd disc as well as wearing better than the Pferd
disc. I am truly impressed with the Cubitron II flap discs and will be
buying them now instead of the Pferd.
Eric