Designed for fixing plasterboard to metal studs of 20-25 gauge (0.55mm-1.2mm). Super sharp point dimples steel at point of contact, providing wobble free and therefore quicker installation. Thread configuration ensures clean, smooth, low torque installation for maximum holding power.Bugle head design for application versatility gives a flush countersink with no paper tearing. Deep Phillips recess reduces dropped or misaligned screws providing fast and efficient fastening. 'Stick Fit' on Zinc range gives push fit on to Drywall Screwdriver bit.