The manual fastening design allows for easy installation and removal without the need for additional tool, saving time Suitable for various handheld drills, with a standard 1 / 2inch threaded interfaces, achieving fast and seamlessly switching, making your work more efficient and Locking design can fix drill bit of 1-10mm, ensuring stable fixation of the drill bit, loosening, improving during use, and reducing the occurrence of accidents Using aluminum to ensures that the clamps is resistant to wear and impacts, suitable for various working environment, keep your tool in the best condition at all times The product is small size and easy to carry or store, perfectly suitable for home and professional homework use