With the Dewalt DT4592-QZ 140 mm machine wood drill bit extension, you effortlessly expand the drilling depth of your wood bits and self-feed cutters. When boring deep holes through thick structural beams or routing pipework and wiring through timber frames, it lets you drill straight through in a single pass without working from both sides. The drill bit locks tightly in place using set screws and the included hex key, eliminating unwanted wobble while drilling. In addition, the shank with flat sides fits securely into standard drill chucks, ensuring dependable torque transfer and preventing slippage under heavy loads.