Round steel chains; metal rigging chains; metal rigging chains comprising a ratchet tensioner, a suspension head and/or at least one ring fork; structural parts for metal chains, namely, chain slings, rigging and lashing chains, chain links, chain joints, chain tensioners, chain sprockets, chain shorteners, suspension heads, suspension links, suspension pivots, chain blocks, rocker balances; devices and components for shortening chains, namely, metal chain connectors, connector bracket, connector clamp, coupling joints, shortening couplers, shortening hooks, shortening claws; metal hardware, namely, metal hooks, metal eyes, expansion braces of metal, metal claws, metal shackles, ring forks of metal, fork heads of metal, metal sprockets, swivel adapters of metal, load rings of metal, metal bolts, metal bolts for fork heads, ring nuts of metal, eye bolts of metal, ring gears of metal, attachment eyes of metal, suspension brackets of metal, suspension points of metal and balances of metal, all for use in connection with chains; chain harnesses of metal and metal bracers for chain harnesses; tensioning devices and spring buffers for lashing loads; overload indicating devices in the nature of tension links of metal and elements for chains, namely, identification tags of metal with integrated chain testing gauge and control elements; structural parts for metal chains, namely, chain links of metal for overload control; metal fittings for containers