Perfect Conversion: The telescopic chuck adapter can convert 1/2" (12.5mm) square socket to 1/4" (6.35mm) hex socket, it can well convert air or power impact wrench into a hex drill, or convert the ratchet into a screwdriver bit holder. Good Performance: The hex chuck converter can finish the conversion quickly, the exquisite workmanship gives it excellent strength and durability , as well as high impact resistance. You can use with confidence. Superior Material: The drill chuck adapter is made of high quality alloy, it has good workmanship, smooth surface, all parts are delicately processed, it is tough and durable, it can maintain the good performance even after long-term use. Easy to Use: You just need to connect the 1/2" square socket with the powerful impact wrench, then connect the 1/4" hex socket with the hex shank drill or screwdriver bit holder. The operation is simple and easy. Wide Application: The quick release chuck converter is used widely in many places, it is well suited for household electric impact wrench conversion, and it is also perfect for professional people, it can greatly improve your work efficiency and save time. Features: Practical and Convenient: The chuck converter can convert quickly according to your need, you can save time and finish your work easily. High quality alloy material has high impact resistance and high hardness resistance, long life and it is more durable. The hex shank adapter can securely mount any 1/4 inch hex drill. Specifications : Material: Alloy Color: Black Quantity: 4 Pcs Size: Top Diameter : 18 mm Bottom Diameter: 22 mm Length: 50.5 mm Package Included: 4 X Chuck Converter