1,With deavy duty design, special quenching treated key parts increases durability, has strong impact resistance. 2,The drill chuck is a 3 jaw design, which can firmly fix various twist drills and step drills. 3,The clamping range of the drill chuck is 1‑10mm, locking and releasing the drill bit is more flexible, with strong practicality. 4,1 or 2in round female socket adapter can easily transform power impact wrench to a drill. 5,Made of aluminum alloy, light weight and wear resistant, not easy to deform after long term use. Item Type: Drill Chuck Material: Aluminum alloy Purpose: Key drill chuck Color: Silver, black Shank Type: 1 or 2in round shank Clamping Range: Approx. 1-10mm or 0-0.4in 2 x Drill Chuck 2 x Chuck Wrench Note: 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.