Self-locking head design speeds installation and locks into place at any length along Cable tie body. Anti slip Roller Ball Head for ease of use. Provides a strong, durable method of cable bundling. Can be used in a wide range of indoor, outdoor, and underground locations (including direct burial). Smooth surfaces and rounded edges assures cable protection and worker safety. Provides the ultimate support for network cables. Perfect for Environmentally harsh conditions. Excellent for Solar, Mining and all Industrial applications. Non magnetic.