Faithfull Flat bits are designed to perform fast, clean cuts, will bore all types of timber and are equally efficient when drilling with or against the grain. All bits have a precision ground point and cutting surfaces with extended spurs for faster cutting and a rust protective finish. All sizes except the 6mm have a non-slip hexagonal shank with a locking mechanism compatible with adaptors or chucks with a built-in quick-release feature. They are also impact rated and are ideal for both mains or cordless drills. Made to DIN 3126 quality with 1/4in hexagonal non-slip shaft. A 300mm extension shank is available for use with flat bits of 16mm and above. Description: Flat Bit Diameter: 20mm Overall Length: 152mm