These black heavy duty zip ties measure 20 inches long and are crafted from Nylon 66, ensuring high durability and strength for various tasks. Designed with a wide 12mm width, they provide extra support for securing cables, wires, and larger objects. With a tensile strength of 250 lbs, these cable wraps are reliable for heavy-duty jobs both indoors and outdoors. Their heat resistant and waterproof properties make them ideal for outdoor environments, tolerating temperatures ranging from -31℉ to +185℉. The self-locking design features a 4-teeth ratchet mechanism for secure fastening, while still allowing reuse using a pin release method for convenience. Perfect for organizing cables, fixing heavy items, and DIY projects around your home or workshop.