This 4′ by 15′ Aluminum Gangway with Thruflow Gray is attached to the stone steps with a 4×4 PT board and our Abutment Angle Hinge Kit. The 4′ Gangway Roller allows the gangway free movement on the EZ Dock in fluctuating water levels. They also added a transition plate dock end in gray for its function and look. The dock is (5) 60″ x 120″ dock sections with a corner gusset.