A 40mm x 152mm Bosch Expert Self Cut Speed Flat Drill Bit for fast and rough drilling in all types of softwood, including drilling holes for cables, pipes and other hardware installations. Bosch Expert Self Cut Speed Flat Bits are three times faster than standard drill bits and feature a patent threaded tip, which draws the spade bit into wood with only the lightest pressure from the user – ideal when drilling upside down or in tight spaces. This flat drill bit has a 1/4” Hex shank for use with three-jaw drill driver chucks and hexagonal drill driver chucks.