Right angle, laser heat treated teeth grip better and last longer. Permalock fastener eliminates nut and bolt failure. Undercut tongue and groove won't slip. Reinforcing edge minimizes stress breakage. Right angle, laser heat treated teeth grip better and last longer CHANNELLOCK uses high carbon C1080 steel for superior performance on the job, and an electric coating for ultimate rust prevention. CHANNELLOCK Blue grips for comfort. There was no sacrifice made, these have comfort and durability needed to last! These are Big as the job, Big as you need! Capacity: 4-1/4"; 108 mm.