Cimport FSPIN300 - SPIN Flaring Set: 5 Tools (1/4", 3/8", 1/2", 5/8", 3/4") Designed for the most common tubing diameter in HVAC, the SPIN Tools preserve copper's/aluminum's malleability while doing the flaring, avoiding cracks and leakage. The SPIN Flaring Tools make flares with the ideal dimensions for a perfect packing, due a wider area of contact between the flare surface and the valve/tube accessory. To top that, the SPIN Flaring Tools are able to make single flares in just 5 seconds. To perform the flaring in copper/aluminum tubing, you only need to attach the correspondent SPIN Tool into a hand drill*. As they perform their job using high temperature, due friction, no clamping tools or holders are necessary. Flares made with the SPIN Tools are compatible with high pressure refrigerants, such as R410A.