Clearfix screws are the newest in technology related self drilling screws for polycarbonate roofing.
These screws not only drill their own hole in the timber or steel supporting beam but they also pre-drill the polycarbonate with an oversized hole to allow for the sheet's expansion and contraction.
These are the screws used for The 5 Rib (Trimdek) profile polycarbonate sheeting.
These screws come with 26mm domes.
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