The size of the cable railing wire can vary depending on the specific application and the desired aesthetic. Cable railing systems typically use wire ropes made of stainless steel that range in size from 1/8 inch to 3/8 inch in diameter. The most common size for residential applications is 1/8 inch, while larger diameters are often used for commercial or industrial applications where greater strength is required. However, it's important to note that the specific size of the cable railing wire will depend on factors such as the distance between posts, the height of the railing, and the weight that the system needs to support. Therefore, it's best to consult with a professional installer or manufacturer to determine the appropriate size for your specific needs. Viewrail's Standard cable railing is 5/32" cable railing wire.