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The MK Morse Master Cobalt premium line of professional quality bi-metal hole saws features an M3 high speed steel cutting edge which is electron beam welded to an extremely tough steel backer. The caps can stand up to hard abuse and punishment, but at the same time are lighter and easier to use than most competitors. The positive rake tooth design on these master cobalt hole saws provides longer life and easier cutting as well as better chip clearance as the teeth cut into metal, wood or plastic. The combination of the backer, cutting edge and cap creates a hole saw that provides faster and longer lasting cutting action. Try these superior MK Morse Master Cobalt hole saws today!