Spring Tube Bender Kit 1/4" 5/16" 3/8" 1/2" & 5/8" Package Content: 5 x Spring Tube Bender Kits operates perfectly in hand bending copper, aluminum and other thin walled tubing. Size: 1/4, 5/16, 3/8, 1/2 and 5/8 Outside diameter (in) Belled at one end to facilitate removal The length of the each spring is: 8 inches.