Uniweld 70028 Spring Tube Bender Set for 1/4-Inch, 3/8-Inch, 1/2-Inch, 5/8-Inch OD Soft Copper and Aluminum Tubing Spring Tube Bender Set 1/4in, 3/8in, 1/2in, 5/8in O.D Fast and professional looking free-form bending of soft copper and aluminum Spring slips over the tubing and prevents collapsing of the tube walls while bending