Specifications: Features: - Made of brass material, good quality. - Fit Dremel, other rotary tools, pin vises. - It can be used in hardware, hobby, home etc. - 10 different sizes you can use. Color: Gold Material: Brass Clamping Diameter: 3.2mm, 3.0mm, 2.4mm, 2.2mm, 2.0mm, 1.8mm, 1.6mm, 1.0mm, 0.8mm, 0.5mm Shank Diameter: 4.3mm/0.16inch Suitable: rotary tools, pin vises Package Include: 10 X Drill Collet(The nut is not include.)