VEVOR Linear Motion Set, SBR20 1500mm, Comes with Two 59 in/1500 mm SBR20 Rails & Four SBR20UU Blocks, Ideal for DIY CNC and Automation Tasks

I would suppose you could use them outdoors, at least for a while. The mounting brackets on the rails are aluminum but the rails them selves appear to be chromed steel. The bearing bodies are aluminum and have plastic parts to retain the ball bearings that are inside. Personally, I wouldn't leave them out in the weather.

Yes, mine are outside. They are coated to avoid rust.

I don’t really know. The rail base is aluminum and the rail looks to be stainless steel but may just be a chrome plated steel. You may be applying some sort of rust inhibitor on a regular basis.

Probably not, it is carbon steel and therefore could rust. I use my indoors (garage) where it is not exposed to the weather. I have no experience with it outdoors.

I'm Sure They Will Rust Not Recommended

I wouldn't they're steel.

They are an 1" 3/8"

1.150" from center to center. 5.815" center to center lengthwise.