Profile: HTC/Tops-All Clamps, Inc. manufactures injection nozzles and tips, non-return valves, injection mold clamps and accessories. We specialize in swivel-based adjusting screw. The swivel-based screw permits fast, sure adjustments, protects platen against scoring, eliminates threaded bolt hole distortions and reduces set-up time. With a tilting action, the swivel base even adjusts uneven platen surfaces.