Features:1.This twist drill chuck set is made of copper with excellent workmanship.2.Three - jaw head design, can be clamped 0.3-3.2mm range. Easy to use and replace.3.The collets can go with twist drill as a mini hand drll for ABS board, aluminium shet, paperboard drilling. Perfect for combined use with a hand drill or electric drill.4.Tools accessories, Replacement and General repair equipment included: Bathroom fixture & hardware, sanitary ware suite, bathroom shelves, soap dishes, hardware, locks, ors, electrical equipment & supplies, switches, kitchen fixture, wallpapers, lights & lighting, hand tools, screwdriver, wrench, pliers, tool sets, measurement & analysis instruments, electric soldering supplies, tool parts. Specification：Material: Brass + Aluminum alloyColor: Black+GoldSize:Tail diameter: 2.0/2.35/3.0/3.17/5.0mmOverall length: 33mmPackage Contents: 1 x Drill chuck1 x Hex wrenchNote:Light shooting 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.