RV Designer Coupler Lock Pin w/ Chain 1/4in x 1 3/8in. These coupler lock pins are constructed with zinc plated steel to protect from rust and corrosion. Each package contains one coupler lock pin with a chain. Features of RV Designer Coupler Lock Pin With Chain 1/4in x 1 3/8in Features a security chain that can be fastened to all couplers to prevent it from getting lost Constructed with zinc plated steel Resists rust and corrosion Dimensions: 1/4" x 1-3/8" Each package contains one coupler lock pin with a chain Package Contents: RV Designer Coupler Lock Pin With Chain 1/4in x 1 3/8in RV Designer H420: Coupler Lock Pin w/ Chain 1/4in x 1 3/8in