1. Wide Applicability This key extender is designed for mounting various standard hex bolts and nuts, ensuring a seamless connection with 1/2' or 21mm hex wrenches and offers versatile compatibility. 2. Wide Range of Applications Our wrench extension tool is widely used in automotive vehicle maintenance and mechanical equipment installation, effortlessly handling both professional machine repairs and daily home repairs, making it the helper for various application scenarios. 3. Convenient Use Achieve a more comfortable and efficient working experience with the quick plugin interface of the wrench extender tool. Say goodbye to timeconsuming tool changes and benefit from improved work efficiency. 4. Good Material quality materials ensure the durability and service life of this wrench extension tool under harsh working conditions. Its wear and impact resistance, thanks to its strength alloy steel construction, make it the choice for tough use where other tools could fail.