Tender For manufacture and supply of 6 mm thick nylon cord reinforced grooved rubber sole plates for 60 kg 1 in 8.5 for derailingswitches [t-6068], alt-4. [this is a safety item]. note:list of 6 mm thick nylon cord reinforced grooved rubber sole plate for each set are as per the rdso drawings as mentioned in annexure-i. specification: irs/t-55/2023.