Maybe this would help:
Rails & Rail Fittings by Discount Marine Supplies
Try searching for handrails or rails. Grab bars, at least for us lubbers, seems to generally refer to bathroom fixtures.
I actually got a kick out of that when I first saw it. I was reviewing some architectural plans right out of school
and, looking at the bathroom, I saw 'grab rails' called out in the plans/specifications. Now, I have an immature mind and a tendency towards visualization, so you can imagine...
I laughed for a good few minutes, my boss thought (still thinks) I was an idiot.