These kits come with everything you need to mount enclosures to round poles or beams. They clamp on to a range of pole diameters to hold enclosures securely in place. All of the parts are galvanized steel or stainless steel to resist corrosion and stand up to outdoor use. Mounting hardware includes screws and locknuts for installing enclosures with flanges. Sealing washers are also included to maintain NEMA 4, 4X, and 12 ratings when installing through the back of an enclosure.