This research has studied the possibility of optimizing some of the properties of the precast concrete flags by using by-products of steel fragments from the CNC machines and local slag. the combined influence of these materials338with the water reducing agent. The local slag is produced by the blast furnace from the scrap as a raw material. which is called (steel slag). https://www.chiggate.com/blue-rottnest-island-daisy-seeds-supply/