A&H Abrasives 100898, Misc, Flapwheel, 3x1x1/4" Aluminum Oxide 240 Grit Flap Wheel Flap wheels are ideal for contour sanding. Specifications: Diameter=3 in, Width=1 in, Shaft Diameter=1/4 in Specifications: Grit=240, Abrasive=ALUMINUM OXIDE, Abrasive Bond=PHENOLIC RESIN Specifications: Backing=CLOTH, Backing Weight=X, Maximum Rpm=20000