black phosphated drywall screw is a Fasteners product. Key specs — Origin: china; Price Term: FOB.
Product Description
material: C1022
main feature:with drilling point, bugle head, phillips drive, hardened, coarse/fine Thread
size: all different sizes such as 3.5*19mm,3.5*25mm…also as customers’ require
usage: They are widely used in lightgage steel joist 
We are Anping Huhao Metal Products Factory.We can produce all kinds of screws ..Our products are Common Nails, Roofing Nails, Shoe Tacks, Dry Wall Screws, Concrete Nails, Screws and more
If you have any relate demands on this, please contact us as soon as possible. We are warmly welcome your enquire on our factory
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