... Class 8.8, Class 10.9, Class 12.9Size: M(6--10)*(16-100mm)Detailed Description: ... Class 8.8, Class 10.9, Class 12.9StandardGB37, 1371type,1372type,1373type,1374type,1375 type,1376type, ... professional desingner,manufacture and offer variety of screws in sound quality with reasonable price.2, ... experiece in the production variety of the screws,bolts,nuts,washer and relative hardwarePhotoes as following ...