Specifications: Featuring self-tightening design, the keyless drill chuck is very convenient and easy to use. Made of high quality carbon steel, it has high precision, high gripping force, high reliability and stability. It is widely used for various drill machines, milling machines, lathes, boring lathes and electric hand tools. Item Name: Drill Chuck Material: Carbon Steel Product Models: 1 : JT33 1-13mm Drill Chuck 2 : JT6 1-13mm Drill Chuck 3 : B16 1-13mm Drill Chuck 4 : MT2-JT33 Connecting Rod 5 : MT2-JT6 Connecting Rod 6 : MT2-B16 Connecting Rod Features: Durable, Wear-resistant, Self-tightening, Keyless Product Size: Drill Chuck: 9cm x 4.5cm/3.54" x 1.77", Connecting Rod: 11cm x 1.5cm x 1.5cm/4.33" x 0.59" x 0.59" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. 1 /2 /3 Package Includes: 1 x Drill Chuck 4 /5 /6 Package Includes: 1 x Connecting Rod