These forgefix phillips twin fine thread drywall screws have a zinc plated finish for increased durability the screws come complete with a phillips no2 insert bit their bugle head allows the screw to sink effortlessly into the dry lining eithout the need for countersinking which in turn minimises the damage to the surface applicationdesigned for fitting dry linings to studding zinc coatings prevent oxidation of the protected metal to create a longer lasting finish it does this by forming a barri