Series L100 HSS Straight Shank Long Series Drills | Bright Finish – Metric | General purpose drills to drill steels with tensile strength up to 1,000N/mm2, cast steel, grey cast iron, malleable cast iron, nickel brass and graphite. Point angle: 118?, helix angle: normal, web thickness: normal, relief angle: 10? – 20?, tolerance of diameter: h8, tolerance of f11. Manufactured to BS 328; Part 1: 1986, DIN 340 RN, ISO 494. 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.