Dolle Graz Modular Staircases &ndash; Stairway Kit 12 Treads 95"H - 115"H - Grey Perfect modular staircase for frequent use in confined small areas - indoor use only. Staircase with adjustable height: 95" to 115" for easy attic or loft access Multiple layout options to suit your unique space Premium Beech Wood Stair Treads with a high-scuff-resistant varnish Powder-coated steel for use indoors.