Machine wood screw 55x4,2 coarse

Electro-galvanized (Zn)
Flat-head coarse-thread machine wood screw with cross slot
Specifically designed for fastening wooden building panels (particle boards, plywood, OSB).
The head features "countersinking threads," allowing the screw to be easily driven flush with the panel surface without damaging the surface of the panel.
Also suitable for fastening stone-based boards.
Recommended screw length is typically about 3 times the height of the panel.