The unique flat tail design cleverly hides the crimped end perfectly in the rugged 4 in. x4 in. wooden column, which not only ensures the ultimate visual simplicity and beauty, but also ensures the stability and safety of the structure, which easily passes the strict 4 in. ball test and fully complies with the industry specifications. Our custom socket wrench CT16, as a key accessory for invisible installation, is designed with exquisite craftsmanship to effectively prevent the cable from rotating during the tightening process, ensuring that every step of the installation is accurate, making the invisible beauty even more impeccable. Whether it's a horizontal elegant extension or a clever twist with an Angle, this cable railing kit handles it with ease. It fits perfectly into 2 in. x2 in. and 4 in. x4 in. metal and wood columns to provide all-round security for your balconies, terraces, stairs and even more complex structures. Special note, for the stair installation, we also kindly equipped with a 30 degree Angle washer CR60, to ensure that every detail is perfect. Using a black coating, with excellent UV resistance and wear resistance, no matter the sun or wind and rain, can maintain a timeless aesthetic. The T316 stainless steel inside is a guarantee of quality, with its excellent rust, corrosion and extreme weather resistance, making this cable railing system an ideal choice for indoor, outdoor and even coastal environments.