Used with hand-held drills, 1- and 2-Series Tungsten Carbide-Tipped (TCT) Hole Saws cut clean holes without grinding core. For cutting 9/16–4 in. dia holes up to 1 in. deep, 1-Series Hole Saws include center pilot drill. Cutters up to 3¼ in. dia feature 3/8 in. shank, while 3 5/16 in. dia and larger cutters feature ½ in. shank. For drilling 9/16–1 3/8 in. holes up to 9/16 in. deep, heavy-duty 2-Series Hole Saws feature spring-loaded pilot pin and milled 3-flat shank that fits ½ in. chucks.