Diablo, 4.5 x 1/4, x-lock metal grinding blade, type 27, superior performance & increased productivity, featuring a premium aluminum oxide blend, extra long grinding life, fully reinforced for use in hand held cut off work, ideal for use when working in hard to reach areas, premium aluminum oxide blend, superior quality formulation designed for fast material removal & long grinding life, 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.