The Rebar-Lok system centers and holds rebar in place in concrete block walls before installing grout. High-impact polystyrene braces in 8- and 12-in. sizes hold a wire that is engaged to secure rebar after a wall is built. Install Rebar-Lok at 4-ft. intervals throughout the wall to avoid placing block over rebar and eliminate the need for low-lift grout. Polylok Inc. 888-765-9565.