SM: zinc-plated steel spheric articulated and threaded stem with regulation hexagon. SM-SST: AISI 304 stainless steel spheric articulated and threaded stem with regulation hexagon. The stems are usually supplied in a packing of four pieces compacted by means of a shrink film to avoid any damaging movement during transport. For big quantities, the stems are supplied in wooden boxes and are placed in order, to avoid any damaging movement during transport.
