I had gone to a fence company for an estimate on some fencing and they have racks of all diameter/gauge tubing for fences. They said they use 1 5/8" sch40 EG tubing for theri railings which they sell by the foot. They also gave me the web site for the company they use for the 45's, 90's and terminations to complete the railing. To finish the welds they use a brush on cold galv followed by a spray on cold galv.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT