Extended Reach when Drilling - 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. It has a 1/4-inch hex shank, and is intended for use with drill drivers. 1/4” Hex shank for use with three-jaw drill driver chucks and hexagonal drill driver chucks. Features and Benefits • Extended Reach when Drilling • 1/4-inch Hex-Shank Extension for Self-Cut Speed spade bits delivers extended reach when drilling • Two different extension lengths available at 152 mm and 305 mm Specifications Length: 152mm