Wrench: A mechanical tool created to offer grasp and torque, generally used to tighten up or loosen up nuts and screws

http://franciscoadub187.wpsuo.com/heat-guns-the-ultimate-tool-for-do-it-yourself-crafts-and-home-improvement

Wrench: A mechanical tool designed to offer grasp and torque, generally used to tighten up or loosen up nuts and bolts