Which tool is commonly referred to as groove-jointed pliers?

• A. Channel Locks
• B. Needle Nose Pliers
• C. Diagonal Cutters
• D. Torque Wrench

Answer: (A)

Groove-jointed pliers are adjustable pliers whose jaws slide along a grooved channel, letting you set the opening to grip objects of different sizes. The common name for this tool is Channel Locks, a brand that became a generic reference for this type of adjustable pliers. This design gives a firm grip on round or irregular parts like pipes, nuts, and fasteners, thanks to the serrated jaws and the multiple jaw-width positions provided by the grooved mechanism. The other tools listed don’t use this groove-joint system: needle-nose pliers have long, slender jaws for precision reach; diagonal cutters are meant for cutting wire; a torque wrench is used to apply a specific torque, not for gripping.