To be packaged as a unit of 4 pieces with one 2″ x 6″ hardwood board across the top and one across the bottom of the shank area of the couplers, secured with a 1.25″ non-metallic band. Two 2″ x 6″ hardwood boards are to be placed along the ends of each of the four couplers secured with 1.25″ non-metallic bands around the boards and into the four couplers’ key slots. Two 1.25″ non-metallic bands are to be placed around the shanks of each opposite facing coupler “pair”. A total of 9 non-metallic bands are to be used. Other size included is 2B.