Metal spiral staircase Spec: Stringer:Carbon steel; Tread:38mm solid wood; Baluster:carbon steel/AlMg/S.S 304 Railing:AlMg, S.S304 Handrail: 50mm diameter PVC bakelit/solid wood Material: Tread:Rubber wood, European beech or US red oak,etc. Tread terms: Delivery time:15-20days after payment Payment term:L/C,T/T,Western Union MOQ:1 set Package:wooden box with polyfoam & carton inner protected Order steps: 1)the data need to be provided storey height(the face from the ground floor to first floor), thickness of the floor, the measurements of the hole(length and width) the photo in different point of view around the hole If need to know how to open the hole, the chart of the houses and photo The measurements could be adjust about 10cm, so don’t worry about the accuracy!!! 2)design the drawing for you confirm 3)choice the Model, confirm the color of keel,footplate,handrail and baluster 4)make deal 30%-50%deposit,banace paid on B/L by fax 5)Delivery and installation: the installation instruction will be proviced Just send us your stairs drawing (note stairs height,length and width) to see how it fit and look in your home.