Forgefix general purpose pozi screw csk tt electro brass forgefix csk16eb these forgefix general purpose pozi screws with countersunk heads have an electro brassed finish for increased durability and to suit most internal and decorative requirements they are versatile screws ideal for use in and with many materials ideal for use in many decorative installations can be used with various screw cover caps the electro brassed process of electroplating is similar to the galvanised and zinc