SPAX Timber to Steel 5.5 X 44 Delta Seal

The SPAX solution for timber to steel applications; Board thickness 16mm - 22mm; High corrosion protection from the exclusive DELTA-SEAL coating; SPAX T-STAR plus; Cylindrical head pulls flush into the wood and provides the perfect appearance; Fixing thread pushes the top board tightly down to the joist; No squeaky boards and no need to ever re-tighten the screws; Ground serrations; SPAX drill point predrills the steel sub frame with ease; The SPAX timber to steel screw should only be used in conjunction with the full system.