NUOLUX 8pcs Brass Collet for Dremel Rotary Tools 1mm 1.6mm 2.3mm 3.2mm (Golden) Color: Golden. Material: Brass. Overall Length: 17mm. Clamping Diameter: 1mm1.6mm2.3mm3.2mm. Shank Diameter: 5mm4.3mm4.3mm4.3mm. Measurement error range: 0.05mm. High quality brass collets to fit Dremel, other rotary tools, pin vises.