Direct manufacturer of tin-plated copper drawn bolt slots: KFH-M3-L, KFH-M4-L, KFH-M5-L, KFH-440-L, KFH-632-L, KFH-832-L, KFH-032-L, and other specifications. Shenzhen Hengbo Precision Hardware Products Co., Ltd. specializes in the production and sales of American PEM and Southco standard rivet bolts and various products. A large inventory of commonly used parts is available. Welcome new and old customers to send us your drawings for customization and production.