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 ChuckMaterial: Carbon SteelProduct Models:1 : JT33 1-13mm Drill Chuck2 : JT6 1-13mm Drill Chuck3 : B16 1-13mm Drill Chuck4 : MT2-JT33 Connecting Rod5 : MT2-JT6 Connecting Rod6 : MT2-B16 Connecting RodFeatures: Durable, Wear-resistant, Self-tightening, KeylessProduct 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 items 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 Chuck4 /5 /6 Package Includes:1 x Connecting Rod