ROCKER ARM ADJUSTMENT SCREW AND NUT FOR CHINESE SCOOTERS WITH GY6 150cc & 50cc QMB139 MOTORS OVERALL LENGTH (SCREW): 19.25mm * THREAD SIZE: M5X0.50 BUYER GETS 2 STUDS AND 2 NUTS TAOTAO, WOLF, ICE BEAR, COOLSTER MAX TRADE, JONWAY, JMSTAR, ROKETA, SUNL, TANK, PEACE, COUGAR, GATOR AND MANY OTHERS