- Function and compatibility: This wrench extension tool fits 1/2" or 21 mm hex wrenches and connects to hex bolts and nuts across various standard sizes for seamless compatibility. - Broad applicability: Suitable for maintenance of motor vehicles and installation of mechanical equipment; adapts to different tasks and scenarios, including home repairs. - Practical upgrade: Features an efficient plug-in interface for quick attachment, helping save time and optimize workflow. - Robust construction: Made of high-strength alloy steel with excellent wear and impact resistance, delivering a long service life in demanding environments. - Use scenarios: - Automotive maintenance and repairs at home or shop. - Installation and servicing of mechanical equipment. - General DIY projects involving hex bolts and nuts of varying sizes.