Use this tool to make a flat; flush masonry joints. This flat joint is popular for exteriors because it prohibits moisture from entering the joint adding stability. Due to its size and shape this is a great tool for tucking mortar into the joints as backfill or restoration. Each end makes a difference size joint for versatility. One end makes a 1/2in joint; then flip it around for a 5/8in joint. Made from formed high quality steel for durability. The jointer is then sent through a unique heat-tempering process for hardness and long wear. The steel is then polished for a smooth; perfect joint every time. The shape of the tool provides knuckle clearance as you move along the joints. The overall length of the tool is 10-1/2in long.