Overall Diameter: 1/2"Overall Length: 2-1/4"Cutting Edge Length: 13/32"Shank: 1/4"Mortising Bits Are Ideal For Surfacing Operations And Cut Fast For MortisesAdditional Chip Clearance For Fast MortisingUse With Hinge Template And Templet Guide For Optimal ResultsHigh-Speed Steel Bits Can Be Easily Sharpened To A Very Fine Edge For Smooth, Precise CutsHigh-Speed Steel Bits Work Best With Softwoods