These Forgefix traditional slotted, single thread wood screws have countersunk heads and can be used in many internal and external applications. They have a solid brass construction to avoid corrosion. APPLICATION: Used for both decorative applications and in applications where the screw may come in to contact with the elements avoiding corrosion. Can be used with all manner of wall plugs. Slotted screw driver required. With Slotted screwdrivers it is important to ensure that the tip matches the width of the screw slot, otherwise you run the risk of damaging the screw head. Slotted screwdrivers are available with either Flared or Parallel tips. For the majority of uses the Flared tip is ideal but if the screw needs to be driven below the material surface a Parallel tip screwdriver should be used. Raised head screws have both countersunk and raised structure, which is designed for aesthetic purposes on all types of ironmongery and lighting applications. The single threads have been designed to offer higher pull out values and quicker insertion.Wood Screw Slotted Raised Head ST Solid Brass 5/8in x 4 Forge Pack 40