@handytoolsdaily: One kink can ruin a copper AC line. This internal bending strip supports the tube from the inside while bending and comes in four sizes: 1/4, 3/8, 1/2, and 5/8 inch.copper tube bending tool, AC copper pipe bender, copper tubing bending strip, HVAC tools, copper pipe bending tool#toolupgrade #HVACTools #ACRepair #PlumbingTools #DIYTools