Durable MaterialThe drill chuck is made of high quality alloy, tight clamping, wear-resistant, surface plating, rust-proof and durable. Light weight and small size, no extra burden when using. Three-Jaw DesignThe chuck uses the triangular stability principle to provide superb stability by clamping the drill bit in three directions simultaneously, clamping it firmly and working safely. Universal Hexagonal HandleThe universal 1/4 inch hex handle of the screwdriver chuck easily attaches to your electric screwdriver, transforming your electric screwdriver into a drill or grinder, easy to use and convenient for quick change. Wide Range of ApplicationsUse the screwdriver chuck to transform your electric screwdriver into a small drill or grinder, perfect for daily maintenance, woodworking drilling and sanding, DIY use and improving your work efficiency. Quantity and SizeYou will receive 2 drill chucks, one silver self-tightening chuck with a length of 72 mm and a clamping range: 0.3-6.5 mm and one black self-tightening chuck with a length of 49 mm and a clamping range: 0.3-3.6 mm, which can meet most of your working needs.