Diablo Steel Demon 7 in. Type 27 Metal Cut Off Disc. Diablo's Steel Demon metal Cut Off discs deliver industrial performance, increased productivity and longer cutting life. Featuring a premium ceramic blend that produces quick cuts that deliver up to 6X longer life. A fully reinforced depressed center enables the disc to withstand heavy-duty metal applications such as heavy stock removal or blending. These discs are ideal for flush cuts and working in hard-to-reach areas.