Reserve Bank of India (RBI) Governor Shaktikanta Das on Thursday met PSU and private sector banks CEOs and MDs to discuss rate transmission and persuade them to pass on the advantages after taking note of the non-passing of the benefits of lower interest rates to the consumers following a key policy rate cut by it recently while the banks are said to have raised their concern on protecting their margins to provide for the NPAs and banking operations which may be hit if they start passing on the full rate cut to the consumers.