The forgefix torxfast timber fixing screws have a hex flange head and an extremely coarse thread offering increased holding power in all types of decking timber they are specifically designed to be used in decking construction but are also widely used in all manner of exterior timber fencing and landscaping applications they have a specialist anti corrosion green treated finish and a acq resistant exterior grade coating with up to 1000 hours salt spray protection boxed in 50s with magnetic nut s