TIMCO Wing-Tip S/D Screws Countersunk PH Bi-Metal 5.5 x 120 PK 100 are designed for high-performance, heavy-duty applications where superior strength and corrosion resistance are essential. These bi-metal self-drilling screws feature a wing-tip design that effortlessly drills through timber into steel without the need for pre-drilling. The hardened steel tip ensures rapid, precise penetration, while the countersunk Phillips head allows for a smooth, flush finish on every installation. Perfect for professional use, these screws deliver consistent reliability and long-lasting durability across demanding environments such as construction, cladding, and metal-to-wood fixings.