Makes it easy, safe and quiet. This patented, strength rated, innovative DockHinge dock coupler system works for wood or aluminium docks. It allows you to easily connect dock sections using our simple hitch & hinge system. Step 1: Simply place the hitch over the hinge. Self -supporting and self-contained. Step 2: Tighten the bolt, from above, with one tool: standard 3/4" socket. Self-aligning. Step 3: Done! No gaps. No squeaks. No hassles.