... in practical applications, the air shaft is convenient to operate, quickly, no damage for rolls etc. Introduce ... aerate gun filling gas for the nozzle jet, to make the shaft of off-axle apperance uniform ... and advantages: in practical applications, it is convenient to operate, quickly, no damage for rolls etc.Use: It ... – Ø126mm6 "Ø150mmØ155 – Ø158mm8 "Ø200mmØ205 – Ø208mm machine parts key type air shaft