manufacture and supply of: (i) plate screws conforming to rdso drg. no. t-3912 with latest alterations (ii) plate screws conforming to rdso drg. no. t-3913 with latest alterations (iii) plate screws conforming to rdso drg. no. t-3915 with latest alterations. (iv) plate screws conforming to rdso drg. no. t-3918 with latest alterations(v) rail screws conforming to rdso drg. no. t-4153 with latest alterations..