Application This level drilled post serves as both a structural end and an intermediate post in leveled sections. The black cable railing post kits are designed to fit 1/8" wire rope, making them suitable for DIY stair railings, patio railings, deck railings and other outdoor and indoor railing projects. These cable railing kits feature a smooth surface, with both the posts and wire ropes in a sleek black finish, creating a modern and elegant look for your railing system. Stainless Steel Our railing posts are made of premium T304 stainless steel with a matte black powder-coated finish, making them seismically strong and durable. Wire rope and cable railing fittings are all made of T316 stainless steel, which is corrosion and rust resistant. Rubber grommets will prevent the cable from wearing into the metal posts.