Standoffs are designed to hold materials a predetermined distance away from the surface they are mounted to, or mount two items a set distance apart.
Female unthreaded circuit board spacers do not have threads and resemble a plain, cylindrical tube. They are the most common type of spacer.
Primarily used to secure D-type cable connectors in computers and other electronic equipment. They are typically made from stainless steel and steel, and come in many different finished for different applications. Secure computer cables and panels. Zinc yellow-chromate plated and zinc-plated finish provide some corrosion resistance.