This flaring tool is used to flare the nuts used on your line sets. If your line set does not include flared nuts, you can now do it yourself! It offers sevenl sizes in 1 tool. Sizes include 3/16" 1/4", 5/16" 3/8", 7/16", 1/2", and 5/8". It can be used on soft metals including copper, aluminum and brass tubing. It features a forged steel slip-on yoke and hardened flaring bar. The design of the yoke is perfect for nut and tube ends where there is little space between them. The clamoing design of the bars prevents tube slippage. The flaring tool is satin finished nickel-chrome plated.