One piece self-locking cable ties. No metal barbs. Wrap the tie around cable, slip tail through head and pull tight. Tie locks in place automatically. Snip off excess tail. General purpose nylon 6-6 is a weather resistant grade suitable for use in most practical applications at a continuous temperature up to 185 °F (85°C). UV stabilized black nylon 6-6 is used in continuous or extended exposure to outdoor use.