Exhaust Cap Nuts for GY6 150cc 125cc QMB139 & Honda 49cc engine

Exhaust studs for GY6 150cc/125cc,QMB139, & Honda 50cc engines . M6 can be used on both 49cc and 150cc gy6 . HONDA 49cc use 6mm and most stock gy6 use 6mm as well. Big Bore Heads usually use M8.