Versatile functionality This wrench extension tool fits perfectly on 1/2" or 21mm hex wrenches and allows seamless connection with a range of standard hex bolts and nuts. Broad compatibility Compatible with 1/2" and 21mm hex wrenches, enabling adaptation to various standard hex bolt and nut sizes for flexible use in different tasks. Time-saving solution The fast plug-in interface reduces tool changes and improves work efficiency, delivering a smoother workflow and easier operation. Durable material Made from high-strength alloy steel, it offers wear and impact resistance for long service life under harsh working conditions and tough use where other tools may fail. Practical applications Widely used in automotive maintenance and mechanical equipment installation, supporting professional and home repairs and easily adapting to different tasks. Use scenarios - Automotive maintenance and repair in tight spaces where longer reach is needed. - Mechanical equipment installation or servicing that involves multiple hex sizes. - Routine home repairs requiring 1/2" or 21mm hex fasteners.