Our Timing Belt AT20 For Tile Squaring And Chamfering Machine uses high-quality TPU materials with good resistance to wearing and tearing. A timing belt, clockwise chain, or belt drive is an assembly of a chain and a sprocket that synchronize the movement of the camshaft and the crankshaft in an engine so that the valves close and open at just the right times during every cylinder's exhaust and intake strokes. If your engine has two separate crank shafts, the first and foremost thing you need to do is to replace the timing belt on both cranks. There are two main types of timing belts: a synchronous timing belt and a non-synchronous one. The former is used on all engines except those with twin camshafts. Synchronous belts are generally made from thicker materials, but they also tend to be cheaper than non-synchronous ones. https://www.jarulanconveyorbelting.com/pu-timing-belt/