Arc Abrasives 11133 Mounted Shank Flap Wheels measure 3/4-inch x 3/8-inch x 1/8-inch (shank) and are made from 100% X-Flexed Egyptian cotton especially made for mounted flap wheels. Their balanced construction gives the wheels resilience to pressure at high RPM. They are great for blending, finishing and debarring on very tight areas and cleaning burrs and threads. 120 Grit. Max RPM: 35,000. Pack of 10 flap wheels.