Features 1、Good metal texture, comfortable surface, easy to clamp, so that the output torque becomes larger 2、The unique thrust bearing facilitates the application of torque by the handle into a greater clamping force 3、Clamping force of this self-tightening chuck would increase according to required force 4、Keyless design, tightening and loosening is by hand force, which offers a quicker and easier chucking and unchucking 5、Widely used with various drill machines, milling machines, lathes, boring lathes and electric hand tools Specification Features: Good metal texture, comfortable surface, easy to clamp, so that the output torque becomes larger. The unique thrust bearing facilitates the application of torque by the handle into a greater clamping force. Clamping force of this self-tightening chuck would increase according to required force. Keyless design, tightening and loosening is by hand force, which offers a quicker and easier chucking and unchucking. Widely used with various drill machines, milling machines, lathes, boring lathes and electric hand tools. Specifications: Type: B16 Material: 45# steel Capacity: 0-13mm(1/2") Inner Diameter: 15.733mm(0.61") Out Diameter: 40mm(1.57") Length: 88mm(3.46") Package Includes: 1 x Chuck Package List