This 2-3/8" Round Post Surface Mount Base is made of galvanized steel for durability, can handle posts up to 8 ft. tall, and has four 5/8" mounting holes for anchoring the base to the ground. The round post opening is 2-5/8" in diameter and two 5/16" x 1" hex head bolts are included to secure the post to the base. **NOTE** Mounting hardware sold separately.