Item Type: Drill Bit Hex ExtensionMaterial: High Carbon SteelUses: Suitable for machinery, construction engineering, etc.Extension Rod Length: Approx. 150mm / 5.91in, 300mm / 11.81in (5mm error due to manual measurement)Extension Shank Type: 1/4in Hex Shank1High Carbon Steel: Made of high carbon steel, safe and durable, can hold the drill firmly, make sure your drill won't sway when you use, and can also control the accuracy to the maximum when drilling and driving 2Use Well: Durable construction makes for good rust resistance, suitable for use with wooden spatula heads, can be used well 3Good Maneuverability: Helps to extend the wood spade bit, providing good manoeuvrability for hard reaches bolts and screws, allowing you to get the job done better and faster 4Application: Fits most 1/4in drill extension hex shank inserts and power drills, can be applied to all required screws, nuts, drills, hand drivers, toolboxes and structures, and can be used almost anywhere 5Time Saving: Perfect for mechanics, construction jobs, homeowners or anyone who wants to work easily and simply to get the job done, saving time and effort2 x Extension Drill Bit Set2 x Wrench