Bar Tags Reinforcing Bar IdentificationBar tags provide the key to identifying reinforcing bar (rebar). A typical bar tag shows the number of pieces in a shipment of rebar. It also shows that the various dimensions of a bent bar, bar markings and total weight.CRSI has developed a standardized method of identifying bar bundles from the originating steel mill. Click here to view the Mill Bundle Barcode Standard document.Building (top) and Bridge (bottom) TagsBack of TagComputer Generated Bar TagsInch-PoundMetricInch-Pound and Metric