Creates the most popular masonry joint in the United States. Use this convex jointer tool to make rounded sunken rodded masonry joints. Creates a consistent concave joint every time for a watertight seal. Each end makes a difference size joint for versatility. One end makes a 1/2" joint, then flip it around for a 5/8" 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 10-1/2" long.