Designed for reliability, this steel post base provides a sturdy, weatherresistant foundation for chain link fence posts, lamp posts, mailbox posts, and other cylindrical steel bases. Material and construction: strength steel with a black finish; robust round base with smooth welding delivers stable support in all weather. Easy installation: Predrill a 0.47 inch (12 mm) hole; position the base flange on the desired surface; mark hole locations; secure with the included expansion bolts. Slide your post into the base and tighten the side fixing screws for a firm connection in minutes. Adjustable positioning: Two side fixing screws enable precise post alignment and secure fastening, keeping fence posts, lamp posts, or mailboxes exactly where you want them. The design reduces wobble and maintains stability under regular use or windy conditions. Compatibility and size: Inner diameters 65 mm and 78 mm; compatible with a wide range of post sizes for residential, commercial, or industrial uses. Works with chain link fence posts, lamp posts, mailbox posts, and various cylindrical steel bases. Use scenarios: Install chain link fence posts along a residential yard or commercial perimeter. Mount a landscape or driveway lamp post on sidewalks or entryways. Secure a curbside mailbox post or other cylindrical steel post for residential or industrial settings.