Compatibility: Our wrench extension bar is compatible with 1/2inch drive or a 21MM hex drive extender. This wrench extender adapter is great for professionals. You may need these when working on heavy equipment as a technician. Extra Leverage & Torque: 15inch wrench extender tool bar multiplies torque for loosening rusted or stubborn bolts, seized fasteners or overtightened nuts. Bar end come with a 5/8 inch hex hole, you can attach tool to extension tool for super tight bolts. Chrome Vadium Steel: This wrench extension bar is constructed of quality chrome vadium steel with excellent torsional strength and endurance, which can withstand high torque pressure without deformation or breakage and has a long service life. Comfortable Design: Non-slip grip of wrench extender for maximum control and comfort. The front locking mechanism ensures a stable wrench connection. Hex hanging hole for convenient storage and quick access. Easy to Use: This wrench extender tool can be simply clipped onto an existing wrench handle to effectively extend the working length and amplify the torque applied, you can tackle bolts in tight spaces without hassle. Maximize reach and efficiency. Ideal for working in tight engine bays., Manufacturer: Littimoon