Higher Torque: The drill chuck has good metal texture, comfortable surface and is easy to tighten, so that the output torque becomes larger. EASY TO USE: The chuck adapter features a keyless design for manual tightening and loosening, allowing for faster and easier tightening and loosening. Powerful Clamping Force: The clamping force of this self-tightening chuck increases according to the required force. The unique thrust bearing makes it easier for the handle to apply torque with greater clamping force. Wide Range of Applications: The keyless chuck is precision machined for higher accuracy. Widely used in various drilling machines, milling machines, lathes, boring machines and electric hand tools. Specifications: Model: B16; Capacity: 0-13mm (1/2); inner diameter: 15.733 mm (0.61); outer diameter: 40 mm (1.57 in);