Adjustable wrench

Crescent Wrench. Adjustable Wrench. A Crescent® wrench or pipe wrench. A tool which has a fixed jaw and a movable jaw which is controlled by a spiral gear or slide. It is used to install or remove bolts and nuts of various sizes. The wrench itself comes in a variety of lengths and jaw sizes. A crescent wrench has smooth jaws while a pipe wrench has serrated jaws. British term is adjustable spanner