The Martin Tool Adjustable Hook Spanner is a professional tool designed for tightening shafts and pipes. Made with drop forged steel handles and steel jaws, this wrench comes in various sizes ranging from 2" to 8-1/4". Its Industrial Black finish adds to its durability and usefulness in servicing packing glands, adjustable collars, rings, locknuts, and other similar fittings. With its adjustable opening feature and ability to fit into the holes or slots on the side of flanges or collars, it is a versatile and essential tool for industry experts.