... In Metric: 6mm,8mm,10mm,12mm,14mm,16mm&18mm O.D tubingCM-806-A-R410A For R410A bar: 1/4", 5 ... 4" O.D. tubingCM-808-M-R410A For R410M bar:6mm,8mm,10mm,12mm,14mm,16mm&18mm O.D tubingDetails:1. ... Special design for R410A system, also fit for usual tubing.2 ... finished, make the idle top head in revolution again for 1-2 times and have the flare face in ...