Yonghangbelt caterpillar tracks belts is a loop of flexible material used to mechanically link two or more rotating shafts, most often parallel. Belts may be used as a source of motion, to transmit power efficiently, or to track relative movement. Belts are looped over pulleys. In a two pulley system, the belt can either drive the pulleys in the same direction, or the belt may be crossed, so that the direction of the shafts is opposite.rubber caterpillar tracks belts size :510H=1295.4*32590H=1498.6*32630H=1600.2*34650H=1651*34660H=1676.4*34670H=1701.8*35750H=1905*34810H=2057.4*38