Features: * Made of high quality carbide tipped metal material, very durable. * Simple operation, easy to use and quick perforated. * With 1/2'' (12.7mm) wrench adapter, easy to install. * Can be combined with various small tools, suitable for some narrow corners where electric hand drills are generally awkward to operate and insufficient height. Note:1. Suitable for electric wrench.2. Because the extension rod is long and the handle is heavy, concentricity will be affected when used, and the speed should not be too fast.3. Ensure safety after installation. Specifications: Product Name: Drill Extension Plug Rod Material: Alloy Color: Silver Head: M10Adpater: 1/2'' (12.7mm) Wrench Adapter Optional Parts: M10 Drill Chuck Optional Extension Length: 150mm, 250mm, 400mm, 600mm Suitable for: Some Narrow Corners, In which electric hand drills are generally inconvenient to operate and insufficient height. Quantity: 2pcs/set or 3pcs/set Package includes: Package #: 1 Extension, 1 1/2'' Key AdapterPackage2 #: 1 Extension, 1 1/2'' Key Adapter, 1 M10 Drill Chuck Note:1. Transition: 1cm = 10mm = 0.39 inch.2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.3. Please allow slight manual measurement deviation for the data.