Origin:Mainland ChinaWide applicability Our wrench expander is 1/2 inch or 21mm hex drivers. This key extension adapter is ideal for professionals. Tighten and loosen the washer Designed to extend the key with another key to create more leverage. Suitable for different wrenches, loosen or tighten stubborn rusty nuts and bolts, easier to remove, save effort. To switch to tightening or loosening, you just have to put it on the other side of the key. Durable steel construction The sturdy construction of this master Key extension adapter prevents the drive from slipping or finishing. Heat-treated steel construction makes the key extension strong and durable. Forge body key adapter. Antirust material Heat treated steel, protective coating to prevent rust. This universal wrench works well on rusty nuts and bolts. Resist frequent corrosion and fading. Durable and will last for years. Great key extension tool Master Key Extension adapter saves you time and effort. Ideal for adding more lever heavy duty nuts and bolts, and access to hard-to-access areas. Material: Steel Size: As shown Color: Black Packing list: 1 piece * Wrench expander Due to manual measurement, there may be an error of 0.5-1cm. Please make sure you don't mind bidding before. Due to differences between different monitors, the picture may not reflect the actual color of the item. Thanks!