Snap-On, Blue Point BSGLP10, 10" Curved Jaw Locking Pliers
It would be almost impossible to have a list of best mechanics tools of any sort, without including Snap-On. While locking pliers aren't limited to mechanics, they are used enough by this group of tradesmen, so that Snap-On manufactures a full line-up of them. I've picked this model from their Blue Point series, because it has soft grips, something that their regular Snap-On lineup doesn't have. The padded handles make them easier on the hand, while reducing the chance of slipping and dropping the tool when your hands are oily. They are made of high grade, heat-treated alloys, chrome plated for long life and durability. These pliers offer a jaw capacity of 1.875 inches, with a curved jaw design. With a fine threaded adjustment screw, there's little these pliers won't get a grip on.