What type of wrench features jaws on both ends?

The correct answer is an open-end wrench. An open-end wrench is characterized by having a U-shaped opening on either end that allows it to engage and grip the flats of fasteners such as nuts or bolts. This design enables the wrench to provide a good grip on the fastener while allowing for quick adjustments without the need for full encasement around the fastener, making it useful in tight spaces.

While the box-end wrench has a closed-off end that fits over fasteners and provides better grip and torque, it does not feature jaws on both ends. The adjustable wrench also does not have jaws on both ends but has a movable jaw that can be adjusted to various sizes. The socket wrench, on the other hand, uses interchangeable sockets and is primarily designed for use with a ratchet mechanism, focusing on providing more torque rather than the open structure provided by an open-end wrench.