Biaungdo 1/2" Keyless Drill Chuck Adapter 2.0-13Mm, 1/4-Inch Hex, 20Unf Mount Package Content - You will get 1 x Keyless Drill Chuck. 1 x 1/4 inch Hex Shank. Mount: 1/2-20UNF.(Note: The product is relatively large, please check if the size is what you need before purchasing) Firm 3-Jaw Design - Firmly fixed twist drills and step drill bits with 0.08 inch to 0.5 inch(2mm to 13mm) shank. High Quality Material - The keyless chuck is made of premium alloy steel, durable and sturdy, has a long service life. Quick Install - Quickly connects to any impact driver and converts to quickly switch tasks. Compatible with many different types of cordless drills. The drill chuck can NOT be used counterclockwise. Risk-free purchase-Biaungdo is committed to providing customers with the best quality goods and services.Just try our products and we believe you will love them as much as we do.