Description: Compatible with 1/2-inch drives and 21mm hex socket drives This wrench extender adapter is rear compatible with 1/2-inch drives and 21mm hex socket drives. It can be used in conjunction with tools such as circuit breakers or ratchets. Provide longer lever arms to effectively save energy and tighten nuts. Easy to install and not prone to damaging the wrench. Scope of application This wrench extension tool is widely applicable to various standard wrenches, such as round-head wrenches, open-end wrenches, adjustable wrenches, etc. Note: The width of the wrench should not exceed 1 inch, and its thickness is preferably within 0.32 inches. If you are not sure, first measure the width and thickness of the wrench. Strong magnetic reinforcement groove design The tool adopts a strong magnetic reinforcement groove design, making the fixation and locking of various wrenches more stable and safe. High carbon steel material This wrench expansion joint is made of high-carbon steel, which is sturdy. It can handle tough tasks, such as removing stubborn nuts. Detailed description: Product Name: Wrench Expansion Adapter Product material: Metal Product size: 5.7×4.5cm Colour: Black Note: There may be slight differences between the picture and the actual color of the product. We will do our best to show you the exact color. 2. Please allow for minor dimensional differences resulting from manual measurement. Parts list 1× Wrench expansion adapter