Compatible with both 1/2 inch drive and 21 mm hex drive, our universal wrench extender is designed to help you handle those stubborn rusty nuts and bolts in hard-to-reach areas. Simply flip over to change the function of this wrench extension tool, you can use it to either tighten or loosen those overtightened nuts. Made of sturdy carbon steel with protective coating, this corrosion-resistant, heat-resistant, rustproof wrench extender ensures great durability and high strength. Suitable for deal