Sutton Tools 10 Piece Bi-Metal General Purpose Holesaw SetVaried Pitched Teeth Reduces vibration resulting in greater performance and accuracy Knock Out Slots Aids core ejection Bi Metal HSS with Cobalt Premium quality for toughness and longer life Sutton Tools H125 Series Bi Metal Cobalt Holesaws are designed for a 32mm cutting depth. They can be used for machine or hand drilling and are suited to cut steels, cast iron, non ferrous metals, plastic and wood.