steelspiral staircase Specification: handrail:38mm diameter steel tread:38mm thickness of solid wood Central post: 114mmdiameters.steel Rails: 8mm diameter steel rods Feature: Fashionable -steel wire railing Economical - no material waste Easy installation space-saving Trade terms: Delivery time:20 days after payment Payment term:L/C,T/T,Westion Union,MoneyGram We have done spairs for more than eight years! Just send us yourstairs drawing (note stairs height,stairs length and stairs width)to see how it will fit and look in your home.