These pedal washers annoys noise caused by gaps resulted from over wearing of thread Adding pedal washers could disperses force from thread to washer, avoiding matures wearing of Cranks / pedal thread Make of stainless Steels, strong, rustproof and enduring Make the area near the Cranks thread more evenly stressed and protect the Cranks paint Suitable for bicycles, mountain bikes, road bikes can installed with all types of pedals