Features Easy to Clamp: Good metal texture, this chuck arbor set has comfortable surface, easy to clamp, so that the output torsion becomes larger. Thrust bearing: 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.It is idely used with various drill machines, milling machines, lathes, boring lathes and electric hand tools. Chuck Information: 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 Note: Please note that the new type and old type of this chuck arbor set will be sent randomly, and make sure you will not mind before ordering Features: Good metal texture,  this chuck arbor set is 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. This chuck arbor set is 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 Package List