Pan-Steel® Polyester Fully Coated Cable Ties Speed Up Installation With A Unique Self-Locking Head Design That Locks Into Any Part Of The Tie. Plus, 316 Stainless Steel Is Wrapped In Uv-Resistant, Halogen-Free, Low-Smoke Polyester to Promote Worker Safety and Reliability In Corrosive, High-Vibration, Temperature-Extreme Environments. Extra-Heavy Cross Section, Max Bundle Diameter: 6.0IN, 23.4IN, Tensile Strength: 1335, Black, 50PC.