Profile: Calder Gates offers driveway gates, railings and side entry gates. Our wrought iron railing is provided with top & bottom rails, and 16 mm rails. Railing height is measured from the bottom of the frame to the highest point on the railings. Our wrought iron metal driveway gates are provided with twisted bar, baskets with collars, spear & ball style rail heads, and forged crooks. Our wrought iron arch top driveway gates have silver highlighted fully hammered infills and chunky hammered box section frame.