Diablo's premium thin kerf metal cut-off discs deliver superior performance and increased productivity. Features a premium aluminum oxide blend that produces quick cuts and offers an extra-long cutting life. Unlike other bonded discs on the market, these discs feature a true 0.40 in. design. The thin kerf design provides for a thin cut, allowing your power tool to work at its full potential. Designed to be backwards compatible, these discs work with X-Lock and 7/8 in. arbor angle grinders when cutting metal and stainless steel.