Drywall screws, also known as wallboard nails, are applied to the connections for Gypsum board to the wooden keel and gypsum board to light steel keel. Black zinc (black phosphate) is more popular on the market generally. Blue-white zinc is also available but not too much in Chinese market. More than 80% demand for Drywall screws is about the size of 3.5x25. Because it is widely used to all gypsum board mainly and thickness of all gypsum board are same. Phosphate Drywall screws are the most basic product lines, while the blue zinc drywall screws are a supplement, but both the scope and the purchase price are basically same.
Drywall screw purchase criteria:
1. Head To round
2. To a pointed tip
3. Can not eccentric.
4. Cross recessed round to be living in the middle
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