Self-drilling Screw
1. Standard: DIN, ANSI, GB and non-standard;
2. Head: Hex, head

3. Groove: Phillips or Slotted
4. Surface: white zinc RAL

5. Raw Material: bought from Group Company, with stable quality and completive price;
6. Processing: by cold-forging machines, together with precise moulds;
7. Length: 19-80

8. Other name: roofing screw.
According to customers` drawings and/or samples or designed by ourse