Series S100 HSS Straight Shank Stub Drills | Metric Sizes | General purpose drills for use on automatics and turret lathes. Suitable for drilling steels, cast iron, alloy steel and malleable cast iron. 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: Part 1: 1986/DIN 1897.