wood StairThe type of classic spiral staircase is both elegant appearance and firm in structure.It's combinates of stylish and unique design and western romantic trend.Just a little place .Decorating your home.Technical Sepcification1)Treads:38mm Thickness.The length according to the diameter of the staircase2)Balusters:30mm diameter .Hight:900mm 1100mm.3)Handrail:15mm*60mm 4)Central Post;110 200mm diameter StaircaseMaterial:1)Wood Part Material:Finger Jointed Beech for Treads,Handrail,Balusters.(Other wooden material also can be served;such as .Red Oak,Cherry,Teak,Pine ect)2)Steel Part Material for Cental Post:High-carbon Steel ,or Stainless SteelFeature;1)Shape optional:Covered ,such as L/U/Z/C/S2)Colours and Measures can be changed for customers.It's possible to change the Materials ,finishes,balusters,etc.3)Ease of Installation with Instruction provided.Please send us drawing and /or measurement(At least diameter ,high of the stair and if you need balcony or not in the upper floor)