Knipex Cobra Pliers Set - 3 Piece 7" 10" 12"Knipex Cobra Pliers Set 3 Piece 7" 10" 12". The KNIPEX Cobra Water Pump Pliers are the perfect gripping pliers for every application. The Cobra Pliers will grip any shaped object round square hex or flat with a bite like no other pliers. This very popular three piece set will grip up to 2 3 4". Adjustment at the touch of a button directly on the workpiece with fine adjustment for different sizes and a comfortable grip. Self locking on pipes and nuts