tender for watch tower with installation; 1 watch tower with installation (specifications see tenderdocument) 2 hooks - 7 no.,top hook should be provided 100 cm below the top of poles, and bottom hook should be provided 500 cm above the bottom of poles. the central distance between the top and bottom hooks shall be equally divided to fix remaining hooks. manufacturing - in order to ensure desired compressive strength, rcc fencing poles should be compacted with the help of platform vibrators, surface should be uniform and free from voids. the concrete cover over the reinforcement should not be less than 1.5 cm.