... ,100mm,and triple rail is 1,200 mm.3.Column spacing:mainly four kinds as 1000,1200,1500,2000mm.4.Steel tube's ... size:subject to the design drawings confirmed by both parties.5. Form of Bend and Bottom Plate6 ... its type, length, width, quantity and surface treatment. If any enquiries, please contact us. stair handrail steel ball-joint stanchions with base plate