Item Type: Bender Spring_x000D_Material: Spring steel_x000D_Specification:_x000D_1/4in: Length: Approx. 200mm / 7.9in, outer diameter: Approx. 9mm / 0.4in, inner diameter: Approx. 7mm / 0.3in_x000D_5/16in: Length: Approx. 205mm / 8.1in, outer diameter: Approx. 10mm / 0.4in, inner diameter: Approx. 8.5mm / 0.3in_x000D_3/8in: Length: Approx. 200mm / 7.9in, outer diameter: Approx. 12.5mm / 0.5in, inner diameter: Approx. 10mm / 0.4in_x000D_1/2in: Length: Approx. 207mm / 8.1in, outer diameter: Approx. 16mm / 0.6in, inner diameter: Approx. 13.5mm / 0.5in_x000D_5/8in: Length: Approx. 200mm / 7.9in, outer diameter: Approx. 19.5mm / 0.8in, inner diameter: Approx. 16.5mm / 0.6in 1These spring tube are made of spring steel, which is heat?resistant, corrosion?resistant, and has good relaxation resistance. 2These tube have super elasticity and will not be deformed no matter how they bend during use. 3Provide 5 kinds of spring pipe with different diameters, which can meet your diversified needs. 4These spring tube can be used with pipe benders to obtain better results and are also good replacement parts. 5These spring tube can be used for copper pipes, aluminum pipes, thin?walled steel pipes, etc., bringing a lot of convenience to your life.5 x Bender Spring