Pan-Steel" Retained Tension Ties speed up installation with a unique self-locking head design that locks into any part of the stainless steel tie. Plus the patented locking head design provides the highest rated tension in the industry fastening tightly to high-vibration armored cable pipe tubing conduit rubber boots heat shields and more. Heavy cross section Max bundle diameter: 4.0in 18.5in Tensile strength: 1780 50pc.