purchase of set of roller bearing etc, set of roller bearing ( nei make ) for wag7 loco, each set consists of roller bearing rb 5020 - 02 nos, inner distance piece - 01 no, outer dist piece - 01 no, and thrower- 01 no. as per rdsos drg.no.sk.vl-603 ( alt-07 ) manufacturers drg.no: x-207 rev-nil each set consist of ( a ) roller bearing rb 5020 nei drg.no. x-207 rev-nil ( sl . 21 ) - 02 nos. ( b ) . outer dist piece nei drg.no.x-207 rev. nil, - 01 no. ( c ) inner distance piece nei drg.no. x-207 rev - nil, ( sl.4 ) 01 no. ( d ) thrower nei drg.no. x-207 rev -nil, ( sl-3 ) -01no. [ warranty period: 30 months after the date of delivery ]