A metal beam is a structural element used in construction to support loads and provide stability. A GIRDER is a type of metal beam that is typically used to span large distances, such as between two walls or columns. An I-bar is a metal beam with an I-shaped cross section, which is often used for roof trusses and other load-bearing structures. A T-bar is a metal beam with a T-shaped cross section, which is often used for floor joists and other support structures.