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Haiyan Yihui Hardware Technology Co., Ltd. was eastablished in 2002,located in the north of Hangzhou Bay Bridge Haiyan,it is the center of the circle formed by Shanghai,Hangzhou,Suzhou,and Ningbo,these four cities,and can reach any cities within one hour. Our company has strategic location and convenient traffic. we are a professional manufacturer of standard fasteners,the mainly products include hex bolts, carriage bolts,square head bolt,machine screws,hex flange surface screws,countersunk head bolts,roofing bolt,pin,hex nuts and threaded rods. Standards: DIN, BS, ANSI/ASME, and ISO Size: m6-m16, 1/4-1" Length: 10mm-250mm Grade: 4.8, 6.8, 8.8, 10.9 If you are interested in any of our products, please do not hesitate to contact us. We are looking forward to forming business relationships with customers all over the world.