Torsion Spring (Steel) For Automatic Twist Lock For Blc Wagons To Atl Part No. 72604 And Other Technical Requirements Conforming To Rdso Spec Ification No. Contr-01-Atl-Msg-2011 Of Nov. 2011. Make/ Brand: M/S.Sanrok Enterprises. [ Warranty Period: 30 Months After The Date Of Delivery ] ]