... main products are: bolts, screws, nuts, machine screws, plain washers, spring lock washe rs, wood screws, tapping screws, drilling screws,chipboard ... , Dacromet, and others. Our products are produced in conformity with DIN, ANSI, AS, BS, JIS, GB, ISO or any other standard ... information about our company, you are welcome to visit us. SPRING LOCK WASHER