* Easy to solve all kinds of complex pipe threading * Punching machine crimped steel head, enhance wear resistance, high hardness, not easy to fall off * Round and smooth head, crimped firmly, not easy to take off * 4mm solid wire diameter, strong flexibility, soft and hard moderate, smooth and unhindered through the pipe three-strand plastic steel screwing, tensile force is not easy to break, durable anti-aging, strong resilience * Flexible spring head, high-strength toughness spring design, bend more easily and labor-saving * Round head aperture is slightly smaller, strong bending capacity (round head is more suitable for smaller aperture pipe) * Flat head with a larger hole diameter, you can pull more wire, but also better bundled wire (flat head is suitable for tubes with a larger hole diameter) * Length: 5/10/15/20/25/30m