The patented spring coil design of these tube benders allows you to bend aluminum and copper tubing into complex shapes without crushing or creasing the tube. Simply slip the belled end of the bender over the tubing and slide to the point to be bent. Complete kit contains eight (8) benders for tube sizes: 1/4", 5/16", 3/8", 7/16", 1/2", 5/8", 3/4", and 7/8" OD.