... main products are bolts, screws, nuts, machine screws, plain washers, spring lock washers, wood screws, tapping screws, drilling screws, chipboard screws, drywall screws, furniture screws, rivets, anchors and ... finishing, we provide black oxide, zinc electroplating, phosphate, copper plating, mechanical galvanization, hot dip galvanization, and Dacromet. Our products are produced ...