This black-coloured, quick-change sanding disc is perfect for use in welding, metalworking, and in maintenance, repairs, and operations. It has durable YF-weight polyester backing that is water-resistant and can withstand grinding speeds up to 30,000 RPM. This roll-on sanding disc can be run wet or dry and is resin-bonded for heat resistance. It is 1 1/2 inches in diameter and has 36 grit aluminum oxide abrasive.