... stairswe can supply various of nature stone stairs design,welcome to contact with us. MaterialsNatural Stone (more materials availalbe: granite, marble ... etc.)Stair typeStraight stairs ,spiral stairs ,arc stairs Popular stone for steps granite:G603,G636,G664,G687,G654,G562,G682 ... .Finished polished,honed,bush hammered, sandblasted or customized.Usge Building ,garden ,etc Common sizes tread:110-150 x 30 ...