Input-output norms define permitted raw-material proportions for steel trunk exports and require accountability for imported inputs. Standard Input-Output Norms for CKD/SKD Steel Trunks specify permitted input categories and per unit allowances-carbon/mild steel and related scrap grades, tinplate waste, bronze powder, and metal fittings-with some items accounted on a net to net basis. The norms are currently suspended by public notice. Applicants must ensure imported inputs are those used or required in the export product and determine proportional usage of inputs for different resultant products.