A4 also known as marine grade stainless steel contains a small amount of molybdenum which creates a particular type of steel having a much higher resistance to surface corrosion when compared with standard a2 stainless steel. Zinc yellow passivated plated wood screws with a self countersinking head.
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The screws have a torx hea.
Woodspur screws. They have deep sharp threads that cut into the wood and divide the fibres rather than simply forcing their way through and a penetrating tip requiring no pilot hole or pre drillin.
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