Bracket Material: ASTM A36, Made of three different thickness of plates. Cap Plate: ASTM A572 Grade 50. Bracket Hardware: (2)-3/4X16 Long Grade B7 All thread Rod with Nuts. All welding to be in accordance with AWS D1.1. Brackets and Caps are all available as either plain steel or Hot-dipped galvanized in accordance with ASTM A153. Bracket Hardware is provided as Electro-zinc plated in accordance with ASTM B633. Notes: OEM service is available, different materials and specifications can be customized according to your demands.