Features: Locking design can fix drill bit of 1-10mm, ensuring stable fixation of the drill bit, preventing loosening, improving safety during use, and reducing the occurrence of accidents. Suitable for various handheld drills, with a standard 1/2 threaded interfaces, achieving fast and seamlessly switching, making your work more efficient and convenient. Using high-quality aluminum shell material to ensure that the clamps is resistant to wear and impact, suitable for various working environment, keep your tool in the best condition at all times. The manual fastening design allows for easy installation and removal without the need for additional tool, saving time. The product is small size and easy to carry or store, perfectly suitable for home and professional homework use. Specifications: Material: Aluminum Clamping Ranges: 1-10mm Package Includes: 1Piece Keyless Drill Chuck note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.