Box joint construction A new generation of water pump pliers, for easier and more secure working Press button action for fast and firm adjustment directly on the work piece Selected jaw opening is positively ensured. 11-position adjustment - Single hand adjustment - Self-gripping on pipes and nuts - The guard prevents operators' fingers being pinched. The unique jaw design shaped to eliminate nut burring. Ergonomic design gives you power with comfort. Approximately 60 HRC hardness of gripping teeth. Made of chrome vanadium steel and oil hardened. Knipex