OMG AccuTrac® Steel Insulation Plates are made of Galvalume® coated steel and are available in two designs. A AccuTrac Plate is to be used with OMG manufactured hex head fasteners, Phillips head fasteners or square drive fasteners and square AccuTrac flat bottom plate is to be used with OMG manufactured Phillips head fasteners only. OMG AccuTrac Steel Insulation Plates should be used when fastening insulation with the OMG AccuTrac Tool.