Roto-molded Industrial shock rack with threaded steel rails and aluminum interior “H” shaped frame and Compound Hinge System, 28” deep to fit deeper servers.SKB catalog page (PDF): 28 Inch Deep Series iSheet
Roto Molded Process of forming powdered plastic in a large oven in aluminum molds that rotate on two axis to evenly melt and distribute the plastic giving an even density and strong corners.