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; hexadecimal drive power tools are allowed to be applied 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 applied 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 give you the freedom to drill with one hand, which is great for working in tight spaces. Please note: there may be slight color differences due to lighting and display variations, which does not affect usage. Color: as shown. Material: aluminum. Package contents: 6 x keyless drill chuck. Only the above package content is included; other products are not included. Note: light reflection and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement may vary by +/- 1-3 cm.