The SPIN® tools F4000 Flaring tool set is a 4-piece Flaring set that is developed for soft copper or aluminum tubing only. Recommended use with corded or cordless drills that are 1,800 RPM or faster, the SPIN® tools keeps the tubing thickness for high pressure refrigerants and is perfect for mini splits and ductless A/C units. The F4000 Flaring tool set has the following bits to perfectly flare tubes with the O.D. of 1/4", 3/8", 1/2", and 5/8".