FiberTite Induction Weld (IW) plates are designed to secure roof insulation and roofing membranes in FiberTite Induction Welded Roofing System. All FTR Induction Weld plates have a recessed center and raised flat bonding surface, and come in easy to handle weather-resistant packaging. Plates are 3 inches round, specially coated Galvalume Steel, installed with FTR Magnum Fasteners on steel, wood or structural concrete decks.