- NVent CADDY Cat HP J-hooks are the heart of the nVent CADDY Cat HP System. The J-hooks have a wide base design and smooth beveled edges to provide a large bending radius for current and future high performance data cables and fiber optics. nVent CADDY Cat HP J-hook are available in a wide range of sizes to offer a solution that meets industry standards for Cat 6A and easily accommodates Cat 7, large-diameter fiber optic, inner duct and coax cable. Individual nVent CADDY Cat HP J-hooks can be fastened directly to the building structure or can be used to expand existing nVent CADDY Cat HP J-hook cable supports. The J-hooks are designed to provide a strong and stable pathway support installation.