This is a manual tube bender, model CT-364N-08, designed for bending tubing with an outside diameter (O.D.) of 1/2 inch (12mm). It is made of a high-quality material such as aluminum alloy and steel. This type of tool is often used for plumbing and HVAC (heating, ventilation, and air conditioning) applications to bend soft copper, aluminum, brass, and other thin metals. The bender can create smooth bends up to 180 degrees with minimal effort.