This swager tool kit is a must have for any HVAC/R professional, and can also be used for more general industrial work. Great for fixing heating, cooling, and ventilation systems, and well as refrigerators. Its size and shape allow for access to difficult to reach areas, behind or underneath units. The unique design reduces on-the-job tiredness, improving task efficiency. The five attachment heads range from 3/8 in to 7/8 inches. With a debrurrer included, this kit contains everything you need to properly swage.