Morse Cutting Tools 31540 Adjustable Round Fractional Split Dies, High-Speed Steel, Bright Finish, 1-1/2\ Outside Diameter, 1/2\ Thick, 5/16\
- Twist Drill Angle Gauge Grinding Drill Bits Diameter Center Gauge Sharping Tools.
- Drill bit angle gauge for measuring drill bit 118 degree.
- Made of stainless steel, not easy to rust and bend.