Features The keyless design, tightening and loosening are done by hand, which provides faster and easier tightening and loosening. Widely used with various drills, milling machines, lathes, boring lathes and power hand tools. Made of 45# steel, strong and durable to use. Good metal texture, comfortable surface, easy to tighten, so that the output twist becomes bigger. Beautiful and practical design of the convex and concave surface, so that before and after the set can effectively cope and reduce the shaking jacket. Specification: Material: 45# steel Accuracy: 0.002 Chuck capacity: 0-16mm chuck outer diameter: 46mm/1.81inch Chuck Length: 99mm/3.9inches Shaft Type: M3-B18 Shaft length: approx. 138 mm/5.43 inches Total length: approx. 210 mm/8.27 inches Weight: approx. 1330g Package Included: 1 x Keyless Chuck 1 x M3-B18 shaft Note: 1. Only things included in the package, not other things. 2. Please allow 1-2mm error due to manual measurement. Thank you for your understanding. Package List