Durable 4 mm steel post anchors with a black powder coating for superior rust resistance, built to withstand harsh weather and deliver long term durability and performance. Universal compatibility: four holes on the body and bottom plate allow flexible installation options. Includes expansion bolts and self drilling screws for quick mounting to wood or concrete surfaces, meeting a variety of installation needs. Easy setup: place the post base on your chosen surface, drill holes for the expansion bolts, insert the wooden post, and secure with screws for a fast, stable installation. Versatile applications: compact design is ideal for securing posts for decks, fences, rails, signs, and mailboxes, providing reliable support for many outdoor projects. Materials and finish: 4 mm steel with black powder coating for corrosion resistance. Use scenarios: securing a deck railing post, reinforcing a fence line, mounting a mailbox or garden sign post.