This is for 1 new hose assembly for m939 series trucks, m923-m939  part number 4720-01-153-8240   other number 12276944-4  For front brake chamber hose.  Please check your part number to make sure it fits your truck . Swivel Nut size 6  Ships to the lower 48 states   other locations maybe higher    Thanks  Jeff  P/s  id  0.375   od 0.781   21.50 length  box 2