A hook jaw is a component of heavy duty pipe wrenches. They come in sizes ranging from 6" to 48". Pipe wrenches are a combination of Cast Iron or Cast Aluminum bodies with steel jaws drop forged from steel bar. These wrenches are available in straight and offset patterns with maximum pipe size ranges from _" through 6", and handle lengths from 6" through 48". A special purpose heavy duty adjustable wrench designed for use on iron or steel pipe and pipe fittings.