SKF Economos India Pvt. Ltd. Offers Guide and Backup Rings for Rod or Piston Application. SKF Economos India Pvt. Ltd. Supplies hydraulic seals, advanced engineering plastic, high precision plastic parts, and seal manufacturing machine. The Guide and Backup Rings for Rod or Piston Application come in split and non split design available. This is not only used as guidering, also as plain washer or spacer.