Usage:Indoor Stair Material:Solid Wood (not steel!) Stair Type:Spiral Stairs Type:curved wood stairs Stair Part Material:Solid wood Surface:Smooth Style:Spiral style MOQ:1 set Wood Species:Acacia Size:Customer's requirement Usage:Indoor Place of Oringin:anywhere Outer diameter: 400cm Inner radius: 200cm Step width: 95cm Rotation: 135 degrees