This specification covers the construction of steel furniture tops for use where invoked by other marine furniture specifications. Tops shall be of the following types: type I - top on which the edge binder is flush with the top and the substrate material is steel; type II - top on which the edge binder projects above the upper surface of the top to act as a lee rail and the substrate material is steel; type III - top on which a lee rail is applied to the upper surface of the finished top, the top has a self edge securely bonded to the finished top, and the substrate material is a particle or mineral board core; and type IV - top is an insert panel and the edge binder is an integral part of the supporting furniture unit. Tops shall be of the following grades: grade 1 - substrate material and edge reinforcements for types I, II, and IV, and grade 2 - substrate material is a particle or mineral board core with a minimum density of 45 lb/ft3.