This product is made of high-quality zinc alloy, wear-resistant, sturdy and durable. With 4-jaw and compact design, it is convenient for use. This chuck has large clamping range, which is practical. The high-quality 4-jaw chuck is widely used in small metal lathe.   Item Name: Chuck Set Material: Zinc Alloy Model: Z011A Chuck: 4-Jaw Thread Size: M12 x 1 Features: Durable, Wear-resistance, Large Clamping Range Chuck External Diameter: 12mm - 65mm/0.5" - 2.6" (Approx.) Chuck Internal Diameter: 1.8mm - 56mm/0.1" - 2.2" (Approx.)   Notes: Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.   Package Includes:  1 x 4-Jaw Chuck 1 x Wrench 1 x Connecting Rod 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.