Bosch Professional SelfCut Speed Flat Drill Bit Extension - 305mm

It has a 1/4-inch hex shank, and is intended for use with drill drivers. The 1/4-inch Hex-Shank Extension for Self-Cut Speed spade bits delivers extended reach when drilling. It offers two different extension lengths at 152 mm and 305 mm. This extension is ideal for all applications with spade bits where extra length is needed.