【Premium 1/4" Extension Drill Bit Set】2 pc (6&12 inch) 1/4" spade drill bit extension and 2 pc hex keys. It perfectly works on hard-to-reach bolts and screws. 【Durable Material】Made of high carbon steel, which is strong and reliable, durable, not easy to deform, not easy to bend and break, rust and corrosion resistant. 【Excellent Manufacturing】Ensure that the extension rod does not swing during drilling to ensure the control accuracy of the extension rod. 【Wide Application】Can be used to extend screws, nuts, drills with 1/4" hex shanks. 【Applicable Population】Perfect for mechanics, construction jobs, homeowners or anyone who wants to work.