I used this on the install of the line set for a mini split heat pump. The tubing I used it on was 3/8\" and 5/8\" and this bender worked beautifully. I am just a DYI and have only used one other bender (Eastwood brand) on brake lines and this ratcheting bender was a nice step up. Glad I got it as I kinked both the 3/8 and 5/8 tubing when bending them by hand.