Dormer A170 Parallel shank drills with a standard helix, right hand spiral, 1/2in parallel shank drill, often referred to as a Blacksmiths drill. General purpose drill, ideal for a wide range of materials where chuck holding capacity is limited.Suitable for both hand and machine use. WARNING:-For general purpose light-duty work only.Fracturing of the drill shank may occur if it is used for any other purpose or if extreme pressure is exerted on the drill.Tip diameter: 22.0 mm HSS.Working length: 82mm.Overall length: 158mm.