I'm really wondering how this is on topic, but I love a good tool discussion. Nothing quite like that one special tool that has some miniscule quality that puts it head and shoulders above its competition. For what you describe, you may need some of the ratcheting pliers. I haven't seen any lately, but the maintenance guys at my old job had them. Kinda like spring loaded channel locks at first, but once they were under a load they ratcheted an that multiplied the biting force. It worked really well for gripping rounded bolts and nuts as the teeth of the pliers would sink down into the grade 6 fasteners and hold them. I know they made the same thing in a pair of electricians pliers which had both cutters and crimps in the jaws.