indoor spiral staircase, material: wrought iron and sapele wood. finish:epoxy zinc-rich antirust primer +acrylic acid painting + bright painting . design:generous and special ,make your house distinguished . workmanship: excellent and very firm . colour:gold,black or any color you like . quality:guatantee 10 years of rust-proof and unfading. theindoor spiral staircase can be customized to anyblueprint or dimensions . steel / iron material : wood material : colour : square steel tube China beech silver vein ( SV) square steel solid bar golden teak satin black (SB) rectangle steel tube sapele black matte ( BM) rectangle steel solid bar nyatoh antique bronze (AB) round steel tube white oak oil rubbed copper(ORC) round steel solid bar ebony antique nickel (AN) or other . or other . or other .