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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Galvanized Hex Head Self Driller For Timber Type 17
Commercial Grade 4.6 Hot Dip Galvanized Cup Head bolt and nut AS1434
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Square Drive 10x50 grade 304 decking screws Sold Per Hundred 100
Type 17 Tip. number 2 Square Drive.
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