ScootsUSA 175-17-8376 M6-1.00 x 100 Bolts - Set of 2 M6x1.00 Bolts, 100mm Shaft Length used to bolt the cylinder head to the case in 150cc and 125cc GY6 4-stroke QMI152/157 QMJ152/157 engines and 150cc GY6B 4-stroke ZNEN engines. May also be used in other applications. Set of 2 Thread Size: M6x1.00 Thread Length: 25mm Shaft Length: 100mm Overall Length: 106mm