These ForgeFix TechFast Window Screws are self-tapping and self-drilling screws that are suitable for PVCu windows and door frames with metal reinforcement They have a countersunk head with TORX® compatible recess Drill tip for self-drilling into steel These screws are fire resistant and are protected by Elementech corrosion resistant coating which has been salt spray tested to 1000 hours They comply with EU safety health and environmental requirements TORX® compatible impact bit included