... amount is over USD 20,000,000, With more than 8 years' development, we have established solid business relationships with customers ... clients. Our main products are: bolts, screws, nuts, machine screws, plain washers, spring lock washe rs, wood screws, tapping screws, drilling screws ... specifications or against our customers’ special requirements, in grades 4.8, 6.8, 8.8, 10.9, 12.9, A2-50, A2-70, and ...