Features: new and high quality 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. Durable 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 durable. Drop forged 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. Durable 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. Specifications: Material: Steel ColorBlack Size:Approx.21x11x5mm/0.82x0.43x0.19inches Package Includes: 1x Wrench Extender note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.