You can get more work done in less time by using a Century Drill & Tool Hole Saw. Fit for task, the bi-metal hole saw cuts up to 1-1/2-inch deep holes to help your work just fly by! The blade is made with cobalt high speed steel teeth electron welded a to 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.