Profiles with an open cross-section are classified as open sections or cold-formed steel sections. Examples of these profiles include Z profiles, single-sided and double-sided gutter profiles, as well as French profiles.

These profiles are manufactured in various thicknesses and dimensions. An open section has a distinct gap between its two edges, and the span of the opening from one edge to the other is what distinguishes it from a closed section.

Open sections are generally more cost-effective and more competitively priced than closed sections. Other advantages include high strength, light weight, and easy installation.