Metal Construction Timber to Light Section Screws - Countersunk - Wing-Tip - Self-Drilling - Bi-Metal - Exterior - Silver Organic When the wings hit the

When the wings hit the metal they will break off to permit the thread to self-tap into the metal

with a washered hexagon head

For use when attaching a weather bar or drip rail to PVCu window and door frames to prevent water ingress

Provides a large clamping surface and therefore spreading the load of a fastening

A traditional nut used for all bolting and fastening applications

Metal Construction Timber to Light Section Screws - Countersunk - Wing-Tip - Self-Drilling - Bi-Metal - Exterior - Silver Organic When the wings hit theSpecifically designed to attach wood to light section steel (Max. 4mm). Coarse self tapping thread with wings designed to ream out the timber, so the screw can achieve Max. R. P. M. without burning out. When the wings hit the metal they will break off to permit the thread to self tap into the metal.