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 Set Material: Plastic Iron Quantity: 5Pcs Clamping 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 1/2-20UNF Features: Durable, Easy to Install, Drill Accessory Size: 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's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Drill Chuck 1 x Hexagonal Connecting Rod 1 x Round Connecting Rod 1 x Drill Clamp Wrench 1 x Wrench Conversion Head