6 [ Swim and bow ladders made of metal; letters and numerals of common metal, padlocks and staples for industrial use made of metal; hinges, lift off hinges, heavy duty hinges, butt hinges, strap hinges and piano hinges, all made of metal; clams, stanchions and stanchion sockets, cleats for docks and mooring buoys,all made of metal; hose clams of metal; metal containers for storage of life lines; parafile fittings, cable outlets, pulpits, fender cleats and holders for supporting fenders, all for boats and made of metal; fittings for handles, handles and railings, all for use on boats and made of metal; locklevers, pins as fasteners and bolts, all made of metal; metal door knobs and metal fittings for door knobs; metal hooks for use on boats; and non-electric metal locks ]