Diablo, 4.5 x 1/16, x-lock metal cut off blade, type 27, superior performance & increased productivity, featuring a premium aluminum oxide blend, extra long cutting life, fully reinforced for use in hand held cut off work, ideal for use when working in hard to reach areas, one click, quick change system for grinders, accessory snaps on tool, pull lever to release accessory from tool, no extra parts needed to attach accessory to tool, x-lock accessories are backward compatible, they fit on x-lock grinders & standard angle grinders, standard accessories fit only on standard angle grinders & cannot be used on the x-lock.