window screw countersunk head, double thread, roller sorted, "Top Silver 800" 4.2Xxx

• best extraction values with respect to PVC through asymmetric
  double thread, Ø 4.2 mm
• roller sorted
• surface coated "Top Silver 800"
• cross recess PH2
• spiral point
• brake ribs
• double countersunk head 90° / 60°, Ø 7.1 mm
• screwing into metal with a pre-drilled hole of Ø 3.2 mm
• ift-Rosenheim approved, report no. 509 22430
  and 509 37933/2