Our 1" diameter, two-sided, resin-bonded, aluminum oxide discs have a thickness of 0.025" and can be used for slitting and finishing gold, silver, brass, steel, porcelain and acrylics. Arbor hole measures 1/16". Use with our Screw Mandrels, sold separately. Maximum operating speed: 25,000rpm. Sold in boxes of 100 discs.