MK Morse Hole Saw 1 per box, 4-1/2" (114mm) Diameter Carbide Tipped. Tungsten carbide tooth tips offer the highest wear resistance possible and longer life cutting abrasive materials. Ground and set teeth to help cut materials that bi-metal saws will not cut. Three (3) teeth per inch creates wider gullet for better chip clearance and faster cutting. Maximum cutting depth 1-1/2". (AT72)