You can get more work done in less time by using a Century Drill & Tool Hole Saw. Fit for the task, the bi-metal hole saw cuts up to 1-1/2 in. deep holes to help your work just fly by! The blade is made with cobalt high-speed steel teeth electron welded to a shatterproof, shock-absorbing alloy body. No one likes overspending on tools to make other tools work, so this hole saw can be used in portable electric drill machines, lathes, and milling machines.