Features: * Unique patented locking function, breaking the traditional locking method. * Unique thrust bearing, easy-to-operate torque applied translate into greater clamping force. * Prevent loose in operation more effectively, so that the cartridge clip holds the tool more reliable. Specifications: Product Name: Hex Shank Adapter Material: Steel Color: Black Optional Size: 1/4 to 3/8 Inch, 1/4 to 1/2 Inch Suitable for: Prevent the drill chuck from loosening during operation Quantity: 2 Pcs Package includes: 2 Adapter hexagonal handle Notes: 1. Transition: 1cm=10mm=0.39 inch.2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.3. Please allow slight manual measurement deviation for the data.