ITEM NAME:0.3-8mm Keyless Drill Chuck 1/4 Inch Shank Quick Change Adapter Converter Description: Made from aluminum alloy, rust proof, durable and long service life. 3-Jaw grip impact drill chuck, automatic centering, Strong grasp and high accuracy. Clamping range: 0.3mm-8.0mm. Easy to converter from driving to drilling in seconds and quickly switch tasks and keep the job moving. Suitable for hand drill, electric screwdriver, pneumatic tools and more. Specification: Material: Aluminium Alloy + Carbon Steel Color: Black Capacity Range: 0.3-8.0mm/0.01-0.315inch Outter Diameter: 24.5mm/ 0.96inch Total Length: 74mm/ 2.9inch Package Includes: 1 Piece Drill Chuck Note: Please allow 1-3mm error due to manual measurement,.3-Jaw grip impact drill chuck, automatic centering, Strong grasp and high accuracy. 1 Piece Drill Chuck. Easy to converter from driving to drilling in seconds and quickly switch tasks and keep the job moving.