Drywall Screws Are Black Phosphate Screws Used In Fixing Of Plasterboards To Wooden Or Aluminium Framing. *Drywall Screws Have Deeper Threads Than Regular Screws Which Prevents Them From Dislodging Easily From The Drywall. **Available In Coarse And Fine Thread. **Sizes Available: *Drywall Screw Coarse No6 3.5mmx25mm *Drywall Screw Coarse No6 3.5mmx32mm *Drywall Screw Coarse No6 3.5mmx41mm