* M6 x 1.0 x 32 mm
* M6 x 1.0 x 63 mm

This is a replacement exhaust Stud Bolt and Intake Manifold Retaining Stud Bolts is for the 4-stroke, GY6 50cc 125cc and 150cc engine. These directly replace the stock bolts and it is used on a wide variety of scooters and ATV brands and models that have Chinese built 50cc GY6 139QMB engines. * M6 x 1.0 x 32 mm* M6 x 1.0 x 63 mm supported the Brands of BAOTIAN, BASHAN, BENZHOU, CFMOTOR, CHARMING, DAYANG, DINLI, FUXIN, GEELY, GILERA, HANGLONG, HAOJIN, HAOJUE, HISUN, HONGZHOU, HUATIAN, JIAJUE, JIANSHE, JINLUN, JMSTAR, JONWAY, KAITONG, KEEWAY, KINROAD, KYMCO, LIFAN, LINGBEN, LINGTIAN, LINHAI, LINTEX, LONCIN, LONGJIA, MAWI, MEIDUO, MOTORRO, PIAGGIO, QINGQI, RHON, RIEJU, SACHS, SHINERAY, SKYGO, SUKIDA, TAOTAO, VESPA, VONROAD, WANGYE, WONJAN, XINGYUE, XINLING, XINTIAN, YIBEN, YINGANG, ZHONGYU, ZNEN, ZONGSHEN, etc.