Our one-sided, resin bonded, silicon carbide discs can be used for slitting and finishing gold, silver, brass, steel, porcelain and acrylics. Having abrasive on one side only makes the other side considered "safe" and can make your job easier to accomplish. Arbor hole measures 1/16". Use with our Screw Mandrels, sold separately. Maximum operating speed: 25,000rpm. Sold in boxed of 100 discs.