Description: Made of high quality spring steel material, very durable, excellent elasticity and not easy rust. Suitable for fast, free-form bending of soft copper and aluminium tube. Ideal for use in plumbing and industrial applications. 5 different model tube,can perfectly meet your needs. Usage: Connector for copper tube, aluminum tube, stainless steel tube of thin wall of air condition or refrigerator. Specification: Material: Stainless Steel Color: Silver Length: Approx. 21cm/ 8.27inch Inner Diameter:1/4?,5/16?,3/8?,1/2?,5/8? Package Includes: 5 Pieces Spring Bending Tube Kit Note: The color may have different as the difference display, pls understand. Please allow 1-3mm error due to hand test