12.70 Mm Dia Lock Bolt With Collar With Required Grip Range 19.05 Mm To 25.4 Mm Conforming To Rdso Specn. No. Is/Rdso-Wd/0001:2022. Uv Am Item Ref. : 3100575--Lock Bolts & Collars Used On Freight Stock On Indian Railways. , Sub Item : 3100575001-- [ Warranty Period: 30 Months After The Dat E Of Delivery ] ]