The Grip-Rite ProLok high chairs and tilt-up chairs have a locking head that raises rebar or reinforcing wire mesh to the proper position and secures rebar intersections with no tie wire or bar ties. The chairs are stackable for multilayer grids and reflective for low-light projects. They are suitable for a variety of construction applications including commercial and residential, parking lots and parking garages, driveways, and patios. PrimeSource Building Products. 800-727-7338. [WOC Booth N1627]