Crafted for securing aluminum agricultural siding panels to wood joists without the need for predrilling, the Simpson T09200HWHM metal-panel screw is a reliable choice. Its design includes an extra-sharp point for swift penetration of aluminum panels. The ¼” hex drive and twin-lead threads enable secure fastening of one to three panel thicknesses to the wood substrate. Engineered from Type 316 stainless steel, these screws are built to endure even the most corrosive environments.