1 / 2 " Drive Or 21MM Drive: Our wrench extender is suitable for 1 / 2 inch drive or 21mm drive This wrench extender adapter is great for professionals Steel Construction: Heavy duty construction of this wrench extender adapter prevents drive from slipping or rounding out The heat-treated steel structure makes the wrench extension strong and body wrench adapter Rust Proof: Heat treated steel, the protective coating prevents rust This wrench extender can work great on rusty and bolts Resists daily and tarnishing for years of usage 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 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 Great Wrench Extender Tool: The wrench extender adapter can save your effort Great for addings more leverage on stubborn and bolts and for getting into hard to reach areas, Manufacturer: SHYYOULQE