hole saw 1, superior quality 2,durable in use 3,dependable performance 4, complete in specifications hole saw1,M3/M42 High Speed Bi-metal Edge Welded to Alloy Steel Back for Heavy Duty Cutting.2,4/6 TPI variable Teeth3,Cutting Safely and Efficiently,the Best Way to Cut Large Hole,Clearing the Chips in Touch Materials4,Cutting Depth to 1-1/2"(38mm) and1-7/8"(47mm)5,Diameters from 9/16"--8-17/64"( ...