Use the tool W. Rose™ 5/8" x 3/4" Concave Jointer to make protruding beaded masonry joints. Creates a consistent convex joint every time for a watertight seal popular in historical restoration. Each end makes a different size joint for versatility. One end makes a 5/8" joint, then flip it around for a 3/4" 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.