5-in-1 for 1/4"-5/8" OD Standard Tubing: Covers 5 most common sizes (1/4",5/16",3/8",1/2",5/8" outer diameter) – perfect for thin-wall tubing bending in HVAC, plumbing, automotive repair and home improvement projects. Up to 180° Bending Without Crimping/Collapsing: Flexible spring steel design bends copper and soft metal tubing to any angle (max 180°) with precision; no tube crimping, collapsing or deformation for professional smooth bends. Durable Oil-Hardened Spring Steel with Zinc-Plated: Crafted from oil hardened & tempered spring steel, zinc-plated finish for rust resistance, anti-corrosion and long-lasting durability – suitable for indoor/outdoor job site use. Ergonomic Flared End for Effortless Operation: Flared ends make sliding the spring onto tubing quick and easy; springs back to original shape after each use, reusable and simple to operate for all skill levels. Pro Tip for Perfect Bends: For optimal results, use one spring bender on the outside of the tube and an additional one inside – ensures even, consistent bends every time for complex tubing work.