Self-drilling screws need no pilot hole to cut and fasten. These screws can drill, tap and fasten all at one go. This saves time and saves you from the extra work of drilling and then fastening. Your time, resources and stress will be simplified using the self-drilling screws. they are easy to remove which means they can be re-used when compared to the nail. They are Zinc yellow passsivated with a Coarse thread. Drill capactiy 5mm. For use on Steel purlins. Use 5/16 socket when fixing. 19x6mm Bonded washer included.
