ForgeFix TechFast Window Baypole screws are self-drilling screws suitable for joining bay window and other metal reinforced PVCu sections. They feature a wafer head with a TORX compatible recess and a No.3 drill tip for self-drilling into steel up to 4mm. These screws are fire resistant and protected by 'Elementech' corrosion resistant coating, which has been salt spray tested to 1000 hours, complying with EU safety, health and environmental requirements. An impact bit (TX25) is included. Specifications: Size: 4.8 x 70mm, Pack Quantity: 100, Finish: Elementech, Drive Type: Torx TX, Head Type: Wafer.