I'm ordering some 15mm stainless tube for some rails I'm building. I have to order the tubing from a supplier and can't check it out in person. I'm not sure how thick of a wall to order and would like to know what the wall thickness is on some of the ones out there. Don't want to get too thin of a wall, but don't want it overkill and add a ton of extra weight. If someone could let me know the wall thickness, that would be terrific.

My redrock SS rails are

.589 in outer dia.
.505 in inner dia
.046 in wall

Sorry my calipers are for inches. but it seems like the wall is 1 mm thick

Hope that helps