Handdo 23 Pcs 5C Collet Set Metric 3mm - 25mm × 1mm High Precision 0.0005" Accuracy

Size: 3mm - 25mm Size: 3.0MM to 25.0MM by 1MM External thread: 1.238 × 20 RH Internal thread: 1.041 × 24 RHYou may also like Handdo 29pcs R8 Collet Set 1/32-1inch Mill Chuck Holder High Precision Round Spring Collet Replacement for Mill Machine.