Introducing the SUNKIN Bi-metal Self-tapping Concrete Screws, a versatile and durable fastener designed for a wide range of applications. This screw features a unique combination of grade 18-8 Stainless steel head and hardened steel on lead threads, satisfying the need for easy operation and rust resistance. With its robust design and precise manufacturing, the SUNKIN Screw ensures a strong and reliable connection, making it an ideal choice for exterior projects on concrete, bricks, cement and so on. Whether you're a professional contractor or a DIY enthusiast, this screw delivers exceptional performance and ease of use. Enhance your projects with the SUNKIN Bi-metal Screw and experience the difference that quality hardware can make. To use the screw, you will need a hammer drill and a 3/16 inch masonry bit to predrill a hole on concrete/brick/block/masonry.