Stainless steel Drill Chuck is mainly used on medical instruments, so it requires high precision and anti-dust.

    0.4 - 4mm  JT0

    0.6 - 6mm  JT1  or  B10

    0.8 - 8mm  B10 or 3/8-24UNF

    1 - 10mm B12 or 3/8-24UNF

     1 - 13mm B16 or  1/2-20UNF