RV Designer S Hook 3/8in. This S-Hook is designed for use with trailer safety chains. It features zinc plated steel construction to prevent rust and corrosion. The hook diameter is 3/8". Each package contains two S-Hooks. Features of RV Designer S Hook Versatile and fit many different makes and models of trailers and tow vehicles Designed for use with trailer safety chains Features zinc plated steel construction to prevent rust and corrosion Hook Diameter: 3/8" Each package contains two S-Hooks Package Contents: RV Designer S Hook RV Designer H419: S Hook 3/8in