[Clamping Diameter] - 3.2mm,3mm,2.4mm,2mm,1.8mm,1.6mm,1.2mm,1mm,0.8mm,0.5mm. [Collet Shank Diameter] - 4.3mm / 0.17". [Material] - Made of brass material, Micro Twist Drill Chuck Set. [Package Content] - 10 x Collets, 1 x Drill Chuck, 1 x Drill Chuck Key. [Applications] - Suitable for combined using with hand drill or electric drill, to drill ABS, wood board, press paper, etc..
