Features: Our wrench extender is suitable for 1/2 inch drive 21mm hex drive. This wrench extender adapter is great for professionals. 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. Heavy duty constructions 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. 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. 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:Metal Size:Approx.4.5cm/1.77''x8cm/3.15'' Suitable 1/2" drive ,21mm hex drive Package Includes: 1x Wrench Extender Adapter note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.