DURABLE: This useful assortment of metric hexagonal head self-drilling screws is made from zinc plated, hardened carbon steel for durability. VERSATILE: With a sharp tip for self-drilling, there is no need to pre-drill or tap a thread - simply use a corded or cordless drill or drill driver with the correct size socket to install. MANY APPLICATIONS: Supplied in a handy plastic storage case, they are Ideal for securing corrugated metal or PVC roofing panels, cladding, trunking or other sheet metal assembly parts.