Wood Spiral Staircase 9002-13 Staircase specification: SpaceHeight:2850mm Step Length:700mm Step Height:190mm Step Amount:14+1 Material:Stringer:stainless steel304; Handrail:stainless steel 304; Stair Treads:oak wood or beach wood Note: 1. Customer’s design is available. 2. Sizes and materials can be changed. 3. Price varies on material and dimensions. 4. Design and produce according to architectural sketch. Design will be sent for your confirmation before production. 5. Installation: just screws will be ok. No need welding.