Proper accessories: silver for 0.3 - 6.5 mm, black for 0.3 - 3.6 mm, easy to use, easy to install, safe, fast. Features: 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. Easily lock and release drill bits to quickly convert: change hexagonal shank drives to drilling rigs; Hex shank power tools can be used with drill bits. Wide range of applications: these drill chucks have various specifications and can be adapted to most drills and cordless power screwdrivers; They can be used in cars, garages, warehouses, offices, homes, etc. Easy loading and unloading: this keyless drill chuck converter can go from driving to drilling in seconds, and also allows one-handed operation, ideal for working in tight spaces. Color: As Shown Material: Aluminum Package Contents: 6 x Keyless Drill Chuck Bit Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the real thing. The measurement allowed error is +/- 1-3 cm. Only the items listed are included; other products are not included.