Which tool provides an extra firm grip?

The tool that provides an extra firm grip is the vise grip pliers. This type of plier features a locking mechanism that allows the user to clamp it onto an object firmly, providing a strong and stable grip that can hold items in place without requiring continuous hand pressure. The design of vise grip pliers ensures that they can accommodate a variety of sizes, making them versatile for different tasks where a secure and permanent grip is necessary.

In contrast, other tools listed, such as needle-nose pliers, are designed primarily for gripping and manipulating objects in tight spaces, while channel lock pliers are effective for gripping larger objects and can adjust their size, but do not have the same locking feature. A crescent wrench allows for adjustable gripping of fasteners but does not provide the same level of hold as vise grip pliers due to its adjustable jaw mechanism that relies on user pressure rather than a locking action.