Proper accessories: silver one length is 2.7 inch for 0.3 - 6.5 mm, black one length is 1.97 inch for 0.3 - 3.6 mm, easy to use, easy to install, safe, fast, 1/4 inch hexagon wrench card is a handy power screwdriverFeatures: 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 accessoriesEasily 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 bitsWide 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 car, 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 spacesMaterial:metalcolour:Silver+blackPackage Contents:1 * silver hexagon shank chuck (0.3-6.5mm)1 * black hexagon shank chuck (0.3-3.6mm)Only the above package content, other products are not included.Note: Light 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.