The Porter-Cable 42000 is a template guide kit. The template guide set is made of precision machine steel, ensuring it wont rust or harm the bit if hit. The kit contains template No. 42054, 42036, 42027, 42033, 42045, 42024, 42042 and two 42237 lock nuts. The set can be used with dovetail jigs, hinge butt jigs or just about any place user need to follow a pattern. The guide set will work with all Porter-Cable, DeWalt and Makita routers, as well as those equipped with a template guide adapter for use with Porter-Cable style templates.