Eight abrasive cloth flaps backed by eight brushes gently rotate against your contoured surface eliminating time consuming hand sanding. Thousands of flexible sanding fingers follow irregular surfaces. Turn of a knob feeds out new abrasive strips as needed. 1" X 87" strips rolled inside the plastic wheel are enough for hours of sanding. Lightweight plastic unit attaches to hand held drill or rotary tool. 1" wide abrasive cloth refills come in solid or scored (1/8" cuts). An adapter collar allows you to attach 1/4 shank of Sand-O-Flex to 1/2" shaft of bench motor.