Where can i find a good selection of U-shape steel, i need something like this

Steel shop and Globalhouse . Steel shops are not very hard to find , as you can see a lot of steel bars laying on their racks . Globalhouse has a large selection of steel also .

I understand the 25mm x 13mm but what are those little leg pieces sticking out, do you have a better sectional drawing of it.

I seriously doubt you will find a profile like that but how much of it do you need ?

A lot of steel suppliers on Sukhumvit road, you will see the racks full of sections on display.

Your drawing is confusing. You might have to go to a steel shop and have them make it for you. (weld, gring, etc.)

Sorry, i'm struggling with paint program, here it is clear it is a simple U-shape bar,

those little leg pieces sticking out is merely the walls of the U

And this ~ sign means it doesnt have to be precisely 13 mm, it can be ~ roughly 13 mm.

The only measure that has to match is 25 mm.

Strictly speaking i could make it with only 3 dm, but i'm assuming i need to buy 5 meters, and dont mind that.

Where is Globalhouse ?

Where more exactly are those metal shops on sukumvit ?

Only place i know of is between bigC south pattaya & south pattaya rd,

they have the 25 mm U-shape, but it is just too weak, at best 2 mm and poor material

I think that you will hve to have it made, I don't think that you will find it with those dimensions and thickness pre made. Any good welding shop could make it for you and would make the length that you need.

Ok, then i may as well have it in stainless,

so where is a welding shop in pattaya that do stainless ?