Self drilling and self countersinking has 18mm of thread number 2 square drive.
For attaching timber to steel with no pre drilling.
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14g = 6.4mm outside diameter 10= threads per inch = 75mm over all length.Galvanised Batten Screws, for fastening heavy timbers where corrosion resistance is required, popular in external environments and treated pine.CLICK IMAGE TO SEE QUANTITY PRICE BREAKS
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