purchase of wheels , retainer plates , pin and wheel assemblies of barrage gates of tanakpur power station , bearing retainer plate for 600 mm dia wheel assembly as per modified drawing in 25/21 a , outer retainer plate for additional v- ring for 600 mm dia wheel assembly as per modified drawing i , seal retainer plate for 600 mm dia wheel assembly as per modified drawing in 25/21 a , bearing retainer plate for 500 mm dia wheel assembly as per modified drawing in 25/44 , outer retainer plate for additional v- ring for 500 mm dia wheel assembly as per modified drawing i , seal retainer plate for 500 mm dia wheel assembly as per modified drawing in 25/44 , wheel 600 mm dia steel en 24 as per modication in drg no . 25/26 , wheel 500 mm dia steel en24 as per drg . no . 25/66 , wheel 440 mm dia steel en24 as per drg . no . 25/32 , pin ( 395 mm long ) for 600 mm wheel dia steel 410 as per modification in drg . no . 25/27 , side guide roller assy . of hr gate as per drawing no 25/48 sheets 1to 4 , side guide roller assy . for modified lifting beam of barrage as per drg . no hm/lb/01 sheets 1to02