Polylok, Inc. is an international supplier of plastic injection molded products for the precast concrete and onsite wastewater industries, expands into the masonry accessories business with the introduction of the Rebar-Lok™ System for CMU (Concrete Masonry Unit) wall construction. This unique system facilitates easy rebar centering while eliminating the need to position a lapping rebar every four feet, or lift heavy concrete blocks over preinstalled rebars.