Technifix drywall screw black 3.5 x 25 mm 800 pcs

Gypsum screws or fast -build screws are indispensable for fixing drywall. These black screws resemble chipboard screws, but they do differ. Gypsum screws have a trumpet head for preventing damage to the plasterboard. Moreover, the cardboard stays nicely behind the head. Chipboard screws have a conical head, so that the head goes through the cardboard and only retains the plaster. The emergency of a plasterboard screw is also finer than that of a chipboard screw. These screws have a Philips cross head. Therefore always use a pH screwdriver (or screw bit). The black color of the screws is due to a chemical process that applies a layer of insoluble phosphates to a metal surface. Due to phosphating, the top layer of the screws no longer contains metal. This prevents rusting after applying stucco or latex. This screw can be used in wood, wood fiber boards and plastic.