CF self-tapping screw for drywall in wood

Drywall screws have become a standard fixture for attaching drywall sheets to wall risers or ceiling beams.
The drywall screw for wood has a countersunk head with a cross slot and a wide thread pitch, unlike the drywall screw for metal, which has a fine thread pitch. This design holds the screw better in wood with a loose structure, which results in less tearing or displacement of the material.
This type of fastener is also called a black screw, as it is made of steel with a phosphated coating.

Marking
d – thread diameter
d _k – diameter of the countersunk head
L – length of the screw