Wood screw. Wood screw for indoor and outdoor installation. C4+ Sitac classified by the State Testing Institute and waxed. CE marked and tested. The screw has extra everything and is manufactured to provide maximum grip while requiring less force, which saves machine and battery. Wood screw C4 outdoor all sizes (see also our Wood screw indoor indoor) The screw is extra equipped for maximum quality and performance Cutter tip = Provides a lower torque while reducing the risk of cracks. Saw teeth = Cuts off the wood chips neatly Stem cutter = Cuts away and transports the chips, which leads to a maximum joint. Grooves = Provides a neat countersink Waxed = Reduces the tightening torque and further increases rust protection. This saves both machine and battery Drive + thread = We have developed a thread that allows you to drive our screw up to 20% faster than traditional wood screws.