1/2" Drive Or 21MM Hex Drive: Our wrench extender is suitable for 1/2 inch drive or 21mm hex drive This wrench extender adapter is great for professionals Both Tighten & Loosen Ways: Designed to extend wrenches with another wrench to create more leverage Used on different wrenches to loosen or tighten stubborn rusty nuts and bolts, which can be removed more easily and save effort Change to tighten or loosen, you just need to put it on the other side of the wrench Steel Construction: Heavy duty construction of this universal wrench extender adapter prevents drive from slipping or rounding out The heat-treated steel structure makes the wrench extension strong and Drop body wrench adapter Rust Proof Material: Heat treated steel, the protective coating prevents rust This universal wrench extender can work great on rusty nuts and bolts Resists daily corrosion and tarnishing for years of usage Great Wrench Extender Tool: The universal wrench extender adapter can save your effort Great for addings more leverage on stubborn nuts and bolts and for getting into hard to reach areas, Manufacturer: MINGLEA