I've used countless types of locking pliers / vice-grips through the years and a lot of them are designed to bite in with small teeth which marks up and sometimes destroys the nut / bolt, especially if it slips. The small teeth on flat jaw pliers can't hold much rotational force either, they can clamp two things together but they don't like being twisted. These Irwin's solve both of those issues. Non-marring jaw design that clamps down and surrounds the fastener not allowing it to slip. Irwin Vice-Grip 10LW #newtools #diytools #mechanictools #tools #carrestoration