The best of their kind. By far. Perfectly sized for keeping in a rolled MC tool kit. These go beyond the rest with better design features and faultless metallurgy. A push button quick-adjust slide mechanism gets the jaws sized fast with one hand, and cushioned grips let you apply more force. The Cobra’s box-jointed jaws will grip just about anything. The Python’s flat jaws are designed specifically for use on nuts. The unique locking slide adjustment jaw minimizes damage to bolts and fasteners. Spreads far enough for oversized steering stem nuts! The Cobra (7.25"×1.5"×0.5", 6.1 oz.) is made of chrome vanadium electric steel that is oil-hardened with a jaw hardness of 60 HRC. The Python (7.75"×1.75"×0.6", 8.7 oz.) is nickel-plated.