Fast, free-form bending of soft copper and aluminum tube * Spring type benders with "funnel" ends let you make smooth, no-kink bends * Simply insert tubing into spring, make your bend, and then slide spring off * Set sizes: 1/4, 5/16, 3/8, 7/16, 1/2 and 5/8-inch (6 mm to 16 mm) * Set of 6