These IRWIN Vise-Grip Universal Water Pump Pliers have the following specification:

Length: 150mm (6in)
Max. Jaw Capacity: 29mm

The IRWIN Vise-Grip Universal Water Pump Pliers have been designed with twice the number of groove positions of traditional groove joint pliers to deliver optimal hand and jaw positioning and a superior grip. The specially engineered, all-purpose jaw grips round, hex, square and flat surfaces for incredible versatility. Fitted with anti-pinch, non-slip ProTouch™ grips to enhance user comfort.