The red medium coarseness 3” x 2” x 1/4” Mounted Interleaf Flap Wheel by Black Hawk Abrasives feature non woven sponge-like abrasive flaps alternating with standard aluminum oxide flaps in a fan like pattern around a .25 inch center shank. This polishing hybrid flapper abrasive is meant to be used on a die grinder or a drill and is the perfect abrasive for polishing and finishing tubes, pipes, or on contoured and irregular surfaces.