Series E100 HSS Straight Shank Extra Length Drills - Inch 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. To BS 328 : Part 1 : 1986.
