The Kraft Tool Co. 4” Wood Line Blocks BL350 5 Pairs are high-quality workholding blocks designed for CNC machining and metalworking applications. Made from durable wood, these rectangular brick line blocks are crafted in the United States by the reputable brand Kraft Tool Co. These blocks provide stable and precise workholding for various industrial processes, making them a reliable tool in the manufacturing industry for accurate and efficient machining of materials.