Channellock Pump Pliers, or sometimes called tongue and groove pliers, or better yet, just "pass me the Channellocks" have an adjustable joint that enables the tool to adjust to the size of the workpiece. These Channellocks have long handles which generate lots of leverage, along with its adjustable jaws, allows the user to have a single tool that will fit a wide range of fastener sizes. Their versatility makes pump pliers a must-have tool for a wide range of tool kits, including plumbing, mechanics, and home maintenance/repair. They are especially handy in the kitchen, when you cannot open a jar or bottle. Of course, Channellock tongue and groove pliers are best known for grasping and turning large pipe connnections in the bathroom or kitchen.