Bosch offers the broadest line of hole saws for quick, clean holes in every material from tile and metal to wood and laminate. Bi-metal hole saws have a unique Progressor tooth design that cuts faster and lasts longer in wood in metal applications. the Bosch bi-metal hole saws also have a reinforced shoulder for added strength and longer life. They are made with an 8% cobalt alloy which also adds to their life as well as granting them additional heat resistance. They work with standard or quick-change mandrels, but the quick-change requires an adapter.