Designed for 2x4 or 4x4 post applications. Stainless steel Designed for 2x4 or 4x4 post applications Patented bearing design eliminates metal-to-metal contact for smooth, quiet operation When subjected to 312 hours of salt fog spray testing (BHMA A138.18), zinc plated hardware showed severe corrosion while hardware with WeatherGuard protection withstood these harsh conditions with very little deterioration Meets ANSI/BHMA Made of stainless steel