Sunlite Pedal Washers can be used to provide a better pedal to crankarm interface, or to slightly adjust Q factor (the horizontal measurement between the two faces of the pedal seat on a given crankset). Adding one set of pedal washers will provide approximately a 2mm increase, however you must ensure there is ample room to have at least 11mm of thread engagement when using more than 1 pedal washer.