OE NO: 2108-1006120    21081006120 Reference NO.:  INA : 531067120   GOST : 830900AE2 RUVILLE : 57202  GATES : T42042 Tensioners are belt tensioners used in automotive drivetrains. The structure tensioner is mainly composed of a fixed casing, a tensioning arm, a wheel body, a torsion spring, a rolling bearing and a spring bushing, etc. It can automatically adjust the tensioning force according to the different tightness of the belt, making the transmission system stable, safe and reliable. our  factory workshop