For use with aluminum gates, vinyl gates, wrought iron gates, and ornamental steel gates, these heavy duty hinges connect to both the gate and the hinge post on two adjacent sides of the posts/ verticals for added strength. Adjustable self-closing springs to meet most pool codes. Very strong closing strength! Adjustment wrench and barrel caps are included with purchase. Includes shim for wall-mount applications. These self-closing gate hinges are constructed from aluminum with a marine grade powder coat finish and stainless steel pin for long lasting performance. Replaces most standard Jerith hinges