Phosphated plasterboard screws / drywall screws with fine thread are used in the wall and ceiling area for attaching plasterboard to substructures made of sheet steel with a thickness of up to 1.0 mm. They are screwed directly without pre-drilling. The self-tapping fine thread ensures easy screwing into the plasterboard and ensures an optimal hold in the substructure. The trumpet head ensures optimal countersinking of the screw head on the plasterboard.