Universal Drive hex shank for easy access to electric screwdrivers.[Wide application] Quickly convert any 1/4 inch cordless electric screwdriver into a drill or grinder. One-handed operation ensures that your work is working properly. 1/4 inch hex shank - universal Drive 1/4 inch hex shank for easy access to electric screwdrivers Quickly convert any 1/4 inch cordless electric screwdriver into a drill or grinder One-handed operation ensures that your work is working properly 0.3-6.5MM range - the chuck can be used with drills from 0.3mm to 6.5mm, making it perfect for fine drilling that is not possible with standard chucks colour:Silver + black Material:Aluminum alloy + carbon steel size:90mm length Hexagonal handle drill chuck Clamping range: 0.3 mm-6.5 mm with 1/4 inch(6.35 mm) 57 mm length Hexagonal handle drill chuck Clamping range: 0.3 mm-3.6 mm with 1/4 inch(6.35 mm) 61 mm length Round handle drill chuck clamping rang: 0.3 mm-3.4 mm with 1/8 inch(3 mm ) 59 mm length Round handle drill chuck clamping rang: 0.3 mm-3.4 mm with 1/16 inch(2.35 mm ) Package Contents: 4*Drill Chuck Quick Change Adapter Only the above package content, other 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.