CFHKStore 8Pcs Brass Collet Include 1mm/1.6mm/2.3mm/3.2mm 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. High quality brass collets to fit Dremel, other rotary tools, pin vises. Compatible with most rotary tools used in hardware, hobby, home etc.