Specifications:Made of plastic iron material, the drill chuck is durable to use.With the simple structure, it is easy to install.With the tool set , you can quickly convert hex shank driver into a drill.It is perfect replacement kit for electric drills.Item Name: Drill Chuck SetMaterial: Plastic IronQuantity: 5PcsClamping Range: 6.5mm: 0.6-6.5mm 3/8-24UNF, 10mm: 0.8-10mm 3/8-24UNF, 13mm: 2-13mm 1/2-20UNF, 16mm: 3-16mm 1/2-20UNFFeatures: Durable, Easy to Install, Drill AccessorySize: 6.5mm/2.56", 10mm/0.39", 13mm/0.51", 16mm/0.63" (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 Drill Chuck1 x Hexagonal Connecting Rod1 x Round Connecting Rod1 x Drill Clamp Wrench1 x Wrench Conversion Head