Features: Good metal texture, comfortable surface, easy to clamp, so that the output torsion becomes larger. The unique thrust bearing facilitates the application of torsion 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: Material: 45# steel Chuck Capacity: 1-13mm(1/2") / 0.04-0.5in Chuck Inner Diameter: Approx. 15.733mm / 0.6in Chuck Out Diameter: Approx. 40mm / 1.57in Chuck Length: Approx. 88mm / 3.46in Arbor Type: MT2-B16 Package Includes: 1 x Chuck & Arbor Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering