Proper accessories: Black 0.6 - 8mm , Silver 0.3 - 3.6mm, 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. Wide range of applications: these drill chucks have specifications and can be adapted to most drills and cordless power screwdrivers; They can be applied in car, garages, warehouses, offices, homes, etc. Easily convert your cordless power screwdriver into a drill to quickly switch between different tasks reducing the amount of time needed for a project. [Clamping] The drill bit is clamped with the tip claw, so there is no need to worry about it falling off. Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour: Material:aluminum Package Contents: 2 * Keyless Drill Chuck Bit 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.