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MS railing means mild steel railing.It comes in 12,14,16,18,22 gauges(thickness) and comes in 1/2 inch,3/4 inch 1.1/2 inch as required.Solid bar and hollow pipes are assembled together to make a railing. It goes through a process called anti-corrosion treatment and red oxide is applied and then it is painted.
By doing anti-corosal treatment the life of paint increases (minimum 4-5 yrs) . Anti-corosal is like a paint which stops the metal from catching rust.Sikha is a very good company for anti-corosal.If you do not apply any anti-corosal then you will have to paint the railing after every 2 years.