Use 5 mm batten screw driver bit. Recomend 14 gauge smart for perfect countersink.
Batten screws 5mm internal hex drive 14 gauge x75 mm long grade 304 stainless steel price is per single screw
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Drills pilot hole and countersinks for 14 gauge batten screw plus 2 spare pilot drills.
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Batten screws 5mm internal hex drive 14 gauge x150 mm long grade 304 stainless steel price is per single screw
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