Bosch's metal grinding abrasive wheels with X-LOCK® technology deliver wheel changes that are up to five times faster than conventional angle grinder interfaces. Simply snap the wheel into place on an X-LOCK® grinder with an audible click – no spanner wrench or flange nuts required. The wheel is easily released from the angle grinder with a quick lever pull. X-LOCK® abrasive wheels fit both X-LOCK® grinders and standard 7/8 In. arbor grinders for more flexibility. Crafted with high-quality Aluminum Oxide grit, Bosch metal grinding wheels deliver outstanding speed, durability and performance, for demanding professional applications. This set includes (3) metal grinding wheels.