<p>1200mm intemal dia, wall thickness not less than 120mm, Re-bar for pipe:- circumferential: 21 turns - 8mmФ for inner cage &amp; 16 turns - 8mmФ for outer cage and longitudinal: 8 nos. - 8mmФ for inner cage &amp; 8 nos.8mmФ for outer cage, Re-bar for Collar:- circumferential: 3 turns - 8mmФ and longitudinal: 12 nos. - 8mmФ</p>