... :Name:T-boltsStandard: GB37,1371type,1372 typ,1373 type,1374 type,1375 type,1376 type,1377 typeGrade:Class 4.8, Class 6.8 ... 9, Class 12.9StandardGB37, 1371type,1372 typ,1373 type,1374 type,1375 type,1376 type,1377 typeColorsilver,plainTechnology:cold forging,heat treatment,Packing:in ... years experiece in the production variety of the screws,bolts,nuts,washer and relative hardwarePhotoes as following: T ...