This Dormer A170 HSS drill bit is designed for general machining applications. It features a 1/2" reduced parallel shank, often referred to as a blacksmith's drill, which allows it to be used in a 1/2" chuck. The drill has a 17mm diameter and is made from high-speed steel (HSS) with a steam-tempered finish. It is capable of drilling up to 4 times its diameter without the need for pecking. The drill has a standard spiral flute design, right-hand rotation, and an 118° drill point. Specifications: Diameter: 17mm, Flute Length: 84mm, Overall Length: 157mm.