One-Way Mandrel: This durable one-way mandrel is made from premium bearing steel with a hard chrome electroplated surface for added strength and resistance to wear. The ball head allows swinging in one direction, making it ideal for use on small U-tube bending machines to create precise copper or aluminum tube elbows. The mandrel guarantees smooth, wrinkle-free, and scratch-free bends, and is commonly used in the refrigeration and heat exchange industries. It supports tube diameters such as Φ4.76, Φ5, Φ6.35, and more, with customizable specifications available.