General description These Super Elastic Steel Spring Tubes are designed for bending various types of pipes, including copper, aluminum, and thin-walled stainless steel. The kit includes 5 pieces of 21cm extension springs, providing great convenience for your home improvement projects. Technical specifications Length: 21 cm (8.3 inches) Material: Oil-hardened and tempered spring steel Type: Compression spring kit Usage These spring pipe benders are easy to use and come in 5 different diameters, making them suitable for all kinds of soft copper pipes and meeting various bending needs. Other information Durable and reusable, saving you money Practical design with a high-density steel ring to prevent damage to the pipeline Quality control measures in place before packaging and shipping For any inquiries, please contact customer service