The Faithfull 8 Piece Impact Rated Flat Bit Set will bore all types of timber, across or with the grain easily and cleanly. Each bit has precision ground points and cutting edges with extended spurs for faster cutting. The 1/4in hex shank can be used with quick-release systems and may be used with both mains and cordless drills. Supplied in a sturdy case. Sizes 10, 13, 16, 20, 22, 25, 32 and 38mm. Overall Length 152mm.