3/8" outer diameter SS Tube w/ 12" spacing this is to be used with our 3/8" compression fittings only. These sticks are 10' long and have 10-24 nozzle threads the same as all the nozzles we sell. With the 12" spacing there are 10 total welds per stick and 6" of blank at each end, so when coupled together there will still be 12" spacing.