Features LARGE OUTPUT TORQUE Good metal structure, comfortable surface, easy to clamp, making the output torque greater. KEYLESS CHUCK The keyless design, tightening and loosening is done by hand force, which allows for faster and easier clamping and unlocking. Wide Application Our drill chuck can be widely used with various drills, milling machines, lathes, drills and electric hand tools. Convenient Thrust Bearing The unique thrust bearing facilitates the application of torque through the handle into greater clamping force. EASY OPERATION The clamping force of this self-tightening chuck increases according to the required force. Specifications: Type: B16. Material: 45# steel. Capacity: 0-13mm (1/2") Inner diameter: 15.733 mm (0.61 inches). Outer diameter: 40 mm (1.57 inches). Length: 88 mm (3.46 inches). Features: The unique thrust bearing facilitates the application of torque through the handle into greater clamping force. The clamping force of this self-tightening chuck would increase according to the required force. Good metal structure, comfortable surface, easy to clamp, so that the output torque becomes larger. Keyless design, tightening and loosening is done by hand force, which allows faster and easier clamping and release. Widely used with various drills, milling machines, lathes, drills and electric hand tools. Package includes: 1 x chuck. Package List