----The Fine Thread locks into the decking, while the Coarse Thread locks into the timber joist. Having a Fine Thread close to the head of the screw retains the screw strength, while also keeping the screw head flush with the top of the deck not allowing the decking timber to move down the screw shank during shrinkage. The smooth section on the screw ensures easy pull down and also allows for timber shrinkage between the underside of the deck and top of the joist holding the head in a constant position with the top of the deck.
----With nibs under the head to help with countersinking
----Type 17 cutting tips helps the screw penetrate quickly into the decking.
Size:10g x 50mm,10g x 65mm,12gx65mm,12gx80mm.
Pls contact with our customer service if you need other sizes.