Slip-joint pliers are versatile hand tools used for gripping, twisting, and cutting various materials. They feature adjustable jaws that can be set to different widths, allowing them to grasp objects of various sizes. The design includes a pivot point that enables the user to change the jaw opening by sliding one jaw along the other. These pliers are commonly made from steel for durability and often have rubber or plastic grips for comfort. They are widely used in plumbing, electrical work, and general maintenance tasks, making them a staple in many toolboxes.