【Specifications】Type: B16; Material: 45# steel; Capacity: 0-13mm(1/2"); Inner diameter: 15.733mm(0.61"); Outer diameter: 40mm(1.57"); Length: 88mm(3.46") 【Larger torque】Good metal texture, comfortable surface, easy to clamp, so that the output torque increases. 【Higher clamping force】The clamping force of this self-tightening chuck would increase according to the required force. The unique thrust bearing makes it easier for the handle to apply torque in a greater clamping force. 【Faster and Easier to Use】Keyless design, tightening and loosening is done by hand, which provides faster and easier tightening and loosening. 【Widely Application】Precise machining for accuracy. Widely used with various drilling machines, milling machines, lathes, boring lathes and electric hand tools. Number of Pieces Delivered: 1 Good quality product