General Tools S106 Tubing Bender Set Steel Spring Tubing Benders are a simple and effective means of bending thin-wall tubing without crimping or collapsing the pipe The Tubing Benders are made from oil hardened and tempered spring steel with a zinc-plated finish This set contains 6"popular bending sizes capable of making bends up to 180 degrees For best results, General recommends using one bender over the tube and an additional bender inside the tube. Tube size outside diameters are 1/4, 5/16, 3/8, 7/17, 1/2, and 5/8 inches