Regis Style #4131 Panels are screwless. Posts are 2 1/2" x 2 1/2" x .065" Wall - 8' Centers. Standard section racks 18" per 8' panel. Rails are 1 1/4" x 1 1/4" x .070"(top) x .110"(side). Pickets are 3/4" x 3/4" x .053" Wall. Picket spacing is 3.963". AAMA 2604 Powder Coating. Lifetime Warranty.