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, gripping it firmly and working safely. Universal Hexagonal HandleThe universal 1/4 inch hexagonal handle of the screwdriver chuck easily attaches to your electric screwdriver, transforming your electric screwdriver into an easy-to-use and convenient drill or grinder for quick changes. Wide Range of ApplicationsUse the screwdriver chuck to turn your electric screwdriver into a small drill or grinder, perfect for daily maintenance, woodworking drilling and sanding, woodworking use. DIY and improving your work efficiency. Quantity and SizeYou will receive 2 drill chucks, a silver self-tightening chuck with a length of 72 mm and a clamping range: 0.3-6.5mm and a black self-tightening chuck with a length of 49mm and a clamping range: 0.3-3.6mm, which can meet most of your working needs.