Features [Keyless design] Tighten and loosen by hand, you can clamp and loosen faster and easier. [High performance] The unique thrust bearing helps to apply torques to greater clamping force through the handle. [Wide range of application] This b16 chuck is widely used in various drilling machines, milling machines, lathes, boring machines and electric hand tools. [Exquisite workmanship] The self-tightening chuck is exquisite in workmanship, with good metal texture, comfortable surface, easy to clamp, and the output torques is increased. [Automatic clamping] The clamping force of the drill bit chuck will increase according to the required force. 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