This drill chuck is small and very convenient for you to carry and store. It has a wide compatibility and is compatible with most rotating tools, such as miniature electric drills, electric grinders, etc.Different specifications allow you to choose a suitable one according to your work needs. It is very easy to install and will not waste your time.Made of metal material, it is very durable to use.The length of the drill chuck is 16mm.It is suitable for drill bits, power drill, rotary tool and so on.Item Name: Drill ColletsMaterial: MetalColor: Golden ColorFeatures: Mini, Easy to Install, Widely UsedSpecifications: 1: M8 Nut and 4.8mm Tail Diameter Drill Collets2: M8 Nut and 4.2mm Tail Diameter Drill Collets3: M7 Nut and 4.8mm Tail Diameter Drill Collets4: M7 Nut and 4.2mm Tail Diameter Drill ColletsThe Reference Clamping Range of the Electric Grinding Copper Chuck is as Follows:The Clamping Range of 0.5mm Copper Chuck: 0.3-0.6mmThe Clamping Range of 0.8mm Copper Chuck: 0.6-0.9mmThe Clamping Range of 1.0mm Copper Chuck: 0.8-1.1mmThe Clamping Range of 1.2mm Copper Chuck: 1.0-1.3mmThe Clamping Range of 1.5mm Copper Chuck: 1.3-1.6mmThe Clamping Range of 1.8mm Copper Chuck: 1.6-1.9mmThe Clamping Range of 2.0mm Copper Chuck: 1.7-2.1mmThe Clamping Range of 2.4mm Copper Chuck: 2.1-2.5mmThe Clamping Range of 3.0mm Copper Chuck: 2.6-3.0mmThe Clamping Range of 3.2mm Copper Chuck: 2.9-3.2mmSize Details: Length: 1.6cm/0.6" (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.Package Includes:Set 1:1 x M8 Nut10 x 4.8mm Tail Diameter Drill ColletsorSet 2:1 x M8 Nut10 x 4.2mm Tail Diameter Drill ColletsorSet 3:1 x M7 Nut10 x 4.8mm Tail Diameter Drill ColletsorSet 4:1 x M7 Nut10 x 4.2mm Tail Diameter Drill ColletsThis drill chuck is small and very convenient for you to carry and store. It has a wide compatibility and is compatible with most rotating tools, such as miniature electric drills, electric grinders, etc.Different specifications allow you to choose a suitable one according to your work needs. It is very easy to install and will not waste your time.Made of metal material, it is very durable to use.The length of the drill chuck is 16mm.It is suitable for drill bits, power drill, rotary tool and so on.