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Thor Helical CD Ties have a circumscribed diameter of 9mm, a pointed leading end and a unique drive-shank end. The tie has a two-start helix thread, each having a precise twist accuracy. This patented wall tie replacement system offers cost-effectiveness and safe to use tooling. CD Ties conform to EN 845-1, meeting UKCA and CE Marking conditions for use as a tie for connecting cavity walls and a tension tie for solid walls.