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 , easy to install, safe, fast, 1/4 inch wrench card is a handy screwdriver 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 ; They are essential tool accessories Easily lock and release drill bits to quickly convert: change hexagonal drives to drilling RIGS; Hexadecimal drive are allowed to be applied with drill bits Wide range of applications: these drill chucks have various specifications and can be adapted to drills and cordless 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 spaces Material:metal colour:Silver+black Package Contents: 1 * silver chuck (0.3-6.5mm) 1 * black chuck (0.3-3.6mm) Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.