High quality brass collets to fit Dremel, other rotary tools, pin vises Compatible with most rotary tools used in hardware, hobby, home etc Clamping Diameter:1mm/1.6mm/2.3mm/3.2mm(0.04",0.06",0.091",0.126") Shank Dia :5mm/4.3mm/4.3mm/4.3mm(0.2",0.17",0.17",0.17") Overall Length :17mm/0.67" Material :Brass Color :Golden Measurement error Rang: 0.05mm Package Included: 4pcs Brass Collet (size including 1mm/1.6mm/2.3mm/3.2mm and 1pcs of size) Note: Actual size and measurements may have a little bit of a gap