- Wide compatibility: This key extender is designed to mount various standard hex bolts and nuts, and it connects smoothly with 1/2" or 21mm hex keys for versatile compatibility. - Wide range of applications: Widely used in automotive maintenance and mechanical equipment installation; supports professional machine repairs and everyday home repairs; useful in scenarios such as car engine servicing, heavy equipment setup, furniture assembly, and bicycle maintenance. - Practical upgrade: The wrench extender features an efficient plug-in interface that saves time and improves workflow. - Durable material: Made from high-strength alloy steel, it offers wear and impact resistance for harsh working conditions, ensuring durability and long service life; suitable for tough use where other tools could fail.