They are easier to use than slip joint pliers because they automaticly adjust to the correct size. I have use these on rounded off fasiners when my name brand locking pliers would just slip. Everyone should have a pair of Robogrips in their toolbox.

RoboGrip Heavy Duty 7-inch Length Curved SELF ADJUSTING PLIERS

Sold as each. 9". V-notch jaw. 1-1/2" capacity. Spring loaded. Laminated steel. Ergonomic handles. Burgundy. Blister pack. Manufacturer's number: 30019. Country of origin: China. Distributed by Robogrip/Applied Concepts.