These forgefix screw hooks are zinc plated for increased resistance to corrosion they simply screw directly into timber and similar materials drilling a pilot hole is advisable the screw head is also suitable for use with all types of wall plugs applicationscrew hooks are used to attach cables wires and twine to many numerous applications also ideal as a storage accessory for use as a hanging hook zinc coatings prevent oxidation of the protected metal to create a longer lasting finish it does th