Features APPLICATION: The keyless chuck has good metal structure, comfortable surface, easy to tighten, and has a large output torque. It is widely used in various drills, milling machines, lathes, drills and electric hand tools. THREE BEARINGS - The self-tensioning steel multi-tool chuck features a unique pressure bearing that helps apply torque to greater clamping force through the handle. Self-tensioning design: the keyless chuck has a self-tensioning design and its clamping force increases according to the required force without having to manually support force KEYLESS DESIGN - The steel self-tensioning multi-tool chuck has a keyless design that can be tightened and loosened by hand, allowing faster and easier clamping and releasing. Size: the drill chuck capacity is 0-13 mm (1/2 inch), the inner diameter is 15.733 mm (0.61 inch), the outer diameter is 40 mm (1.57 inch), the length is 88 mm (3.46 inch). Functions: The keyless chuck has a good metal structure, a comfortable surface, is easy to tension, so that the output torque becomes larger. The unique thrust bearing facilitates the transfer of torque through the handle to a greater clamping force. The clamping force of this self-tensioning chuck would increase according to the required force. The self-tensioning multi-tool steel chuck adopts a keyless design, tightening and loosening is done by hand force, which allows for faster and easier insertion and removal. The keyless chuck is widely used in various drills, milling machines, lathes, drills and power hand tools. Specifications: Type: B16 Material: 45# steel Capacity: 0-13 mm (1/2 inch) Inner diameter: 15.733 mm (0.61 inches). Outer diameter: 40 mm (1.57 inches). Length: 88 mm (3.46 inches). Package includes: 1 x chuck. Package List