Create the most popular masonry joint in the United States. The shape of the tool is designed to provide knuckle clearance as you move along the joints. The Brick Jointer is formed from high grade carbon steel for strength. Use this jointer to create an inverted half round mortar joint in brick or block. This concave shape resists rain penetration and creates a tight seal in masonry projects. Each end makes a different size joint for versatility. One end makes a 3/8″ joint, then flip it around for a 1/2″ joint. Overall length is 10-1/2″.