The KNIPEX 12 in. Water Pump Alligator Pliers feature manual adjustment and are made from chrome-Vanadium steel, the tool is self locking on workpieces by downward pressure on the upper handle and it will not slip. Specific manual adjustment allows the tool to be adjusted to 9 different positions for optimal adaptation to the workpiece, whether round, square or hex. Gripping teeth are hardened to 61 HRc for high wear resistance and maximum gripping power. Box joint construction allows high stability while using the tool. Also available in 7 in. and 10 in. sizes as well as a 'push-button' style.