... Certification Ningbo Zhenhai Hualong Fasteners Co., Ltd. Manufacturer of bolts ,nuts,wcrews,washers and other fasteners.We often make the productions ... can make accroding to your drawing or your sampleRegarding to Nuts Type of NutSquare,Hex,Flange,Hex socket,T-type,Coupling ... ) Prompt Delivery6) We have 10years experience of manufacturing fasteners Provide High Quality Square Head Bolts