Series J100 – Metric | General purpose drills for steels, cast steel, grey cast iron, malleable cast iron, nickel brass, aluminium alloy and graphite. Point angle: 118?, helix angle: normal, web thickness: standard, relief angle: 10?-20?, tolerance of diameter: h8, tolerance of shank: f11. Manufactured to BS 328/DIN338RN. | | Bright Finish | Drills with a bright finish are supplied in the as-ground condition and such tools are used generally in the machining of non-ferrous materials.