To prevent the construction sites from halting because of a product, all the products are continuously preserved in the stocks in optimum numbers. In large projects, special stock studies convenient for that project, are carried out. Material requests are delivered in 1-2 hours at the latest inner Istanbul, according to the traffic state. For all other provinces, the products are delivered via cargo or cargo airplanes. Kaletek operates with the sense 7/24, in order to keep the construction-sites working.