supply of set of bearings for pantograph type wbl consisting of 2 items - twelve nos. : 1. single row deep groove ball bearing size: 6006 2 rs -qty: 4 nos. 2. single row deep gro ove ball bearing size 6203 2 rs -qty: 8 nos. of rdso approved sources only. [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ] ws electric loco stores/kgp,