MK Morse 1 per box Hole Saw 4-1/4" 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. 3 teeth per inch creates wider gullet for better chip clearance and faster cutting. Maximum cutting depth 1-1/2-inch (AT68)