Pre-engineered sections 36"W. x 84"H. and features lapped and welded shelf corners for additional strength and durability. Upright posts are roll formed "T" members that allow shelves to adjust on 1-1/2" centers. Order one starter unit and the balance as adders to make up a row of shelving. Five shelf unit (four openings). FOB Shipping Point. See Related Items tab for Heavy Duty 36" Wide Industrial Shelving - Extra Shelves. Surcharge may apply.