CMT 550-105 Multipurpose Hole Saw, 4-1/8" Cut ceramic tiles, wood, MDF, Trespa, plastics, plasterboard, soft bricks, lime bricks and more Long lasting construction grade carbide to provide a 10x longer cutting life Secured tooth technology to prevent any breakage during impact with hard materials Fast lock in one click, fast drill in all conditions, fast bore enlargement thanks to the center drill which can fit two hole saws Plug is effortlessly removed thanks to the innovative slots. Use with CMT center drill 550-HS2 or 550-HW2