Features Exquisite Technology: The Drill Chuck Technology Is Solid, Strong And Durable, Special Treatment of The Claw, with Good Wear Resistance Accurate Forming: Drill Chuck Is Well Made, Possess High Accuracy, Shell Gear And Key Gear Cold Press Forming Reliable And Durable: Drill Chuck Is Easy to Use, Shell, Keyhole, Key After Quenching, Accurate And Reliable, Durable Solid Alloy: The Drill Chuck Adopts Excellent Alloy Material, Possess High Strength, High Thermal Strength, Good Corrosion Resistance, Good Low Temperature Performance Technical Parameters: Connecting Size of Wrench Drill Chuck Is 1/2-20unf, Clamping Range from 1.5-13mm, Very Practical Specification: Item Type: Drill Chuck Material: Alloy Connection Size: 1/2-20UNF Clamping Range: 1.5-13mm Package List: 1 x Drill Chuck 1 x Accessory Package List 1 x Drill Chuck 1 x Accessory