Flares made with the SPIN Tools are compatible with high-pressure refrigerants such as R410a. The high-temperature method preserves the copper or aluminum's malleability while performing the flare, preventing cracks and leaks. The Flaring SPIN tools were developed and are recommended for soft copper tubing sizes 7/8" with wall thickness up to 0. 8mm (1. 0mm for 5/8" tubing dia. ). Because they perform their job using high-temperature and friction, no clamping tools or holders are necessary. 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 perform the flaring in copper/aluminum tubing, simply attach the corresponding SPIN Tool size to a drill (not included). Designed to work along with drills or screwdrivers, with minimum of 1, 800 RPM and 500 watts for corded drills, or superior and 1, 800 RPM and 18V, or superior, for cordless drills. Using the SPIN tools along with less powerful equipment may result in high decrease of performance.