Drywall screws are also identified as self-tapping screws. The application of drywall screws is usually without pre-drilling possible. This kind of screws are differentiated in coarse threads and fine threads. Further you can differentiate in loose items and magazined items. Coarse threads are used for the fastening of plasterboard onto a wooden substructure. Fine threads are used to fasten a plasterboard to a metal substructure (till 0,7 mm). An other design of the drywall screw is with the drywall screw with "drill- point". This screw is suitable for the fastening of a plasterboard onto heavy metal profiles (till 2,5 mm)