The set contains 2 keyless drill chucks and 10 drill bits in the range of 1.0-4.0 mm. One silver lining measures 2.7 inches with a clamping range of 0.3-6.5 mm, and the other black measures 1.9 inches with a clamping range of 0.3-3.6 mm. These sizes are designed to meet a wide range of work requirements. The drill chuck extension is small size, and light weight, which not bring extra burden to your operation. These keyless drill chucks can easily turn a cordless electric screwdriver into a drill or grinder; You need to turn the tail to make adjustments to quickly switch tasks and maintain work progress; They are essential power tool accessories. Featuring a 1/4 inch hex shank, keyless drill chuck bit seamlessly fit into power tools for quick and secure installation. With this quick-replacement capability, you can easily convert your cordless power screwdriver into a drill, enabling seamless transitions between different tasks and reducing project completion time. Made of aluminum alloy material with body, and removable steel connecting rods to withstand rigorous use and provide long-lasting performance. Tough materials reliability and durability so you can tackle a variety of drilling tasks with confidence. With their different specifications, these drill chucks are compatible with most drills and cordless screwdrivers. The two different keyless chucks are suitable for a wide range of applications, including daily maintenance, car repairs, working in garages and warehouses, as well as office and home use. Product Name:2Pcs Drill Chuck with 10pcs Drill Bit Set Easily lock and release the drill for fast conversion: change the hex shank driver to a drill; hex drive power tools can be used with drills. Colour:As Shown Material:Metal Package Contents: 1set * drill propeller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.