stainless steel, high hardness, and in use Diameter drill front edge of the protractor 50 gauge 118 degree angle of twist drills grinding gauge suitable for 118 degree diameter of not more than 50mm of grinding twist drills Check the drill angle ( 60 degree, 70 degree, 90 degree, 110 degree, 118 degree, 125 degree, 135 degree, 150 degree, 160 degree This is a practical Angle gauge set in drill bits Angle measuring and drill sharpener inspection 60 degrees for a tooth-shaped angle 55 degree angle and metric thread, inch thread inspection, and special measuring tools for measuring angles, Manufacturer: NUEAYMS