CRSI Rebar Reference is a valuable tool developed by the Concrete Reinforcing Steel Institute for iPhone users. This app serves as a comprehensive resource for professionals in the construction industry, offering essential information on ASTM standard reinforcing bars (rebar), hook details, stirrup/tie hook specifications, and ASTM bar marking requirements.

Users can access a wealth of standard rebar specifications such as sizes, diameters, areas, and weights, as well as detailed hook information for 90-, 135-, and 180-degree bends. The app also includes minimum yield and tensile requirements according to ASTM standards, along with clear illustrations of industry-standard bar markings for various grades of rebar.