Steel Finished Hexagon Bolts comes in various grades starting from M10 [3/8"] to M52 [2"] ranges. These are hardware fasteners with a threaded hole and applied opposite a mating bolt to fasten a stack of parts together. Steel Finished Hexagon Bolts is manufactured by Technomac [India]. Technomac [India] also manufactures diverse types of fasteners, nuts, bolts, studs, scaffolding accessories of different types and of various sizes. These Hexagon Bolts are made of steel.