Corner 60° Heavy Duty Pro-40 Square F Truss. The Pro-40 Heavy Duty Truss is a larger product line that offers remarkable weight capacities while meeting the demands of larger spans and stand designs such as concert stages, larger exhibition displays, or any other types of indoor and outdoor stages. Made from certified 48x3 mm thick aluminum alloy tubes with 25x3 mm braces, this Heavy Duty version measures 400x400 mm and can be used for both indoor and outdoor applications. Available in the Prolyte-compatible F version or Global/Euro-Truss compatible G version in aluminum color. For other colors, specific lengths, or branches, please contact our sales department.