Made from sturdy carbon steel, these connectors are durable and rust-resistant. They offer stable support and can be easily installed on both concrete and wooden floors, making them versatile for fixed installations in structures like pergolas and porch railings. | Vevor | | 4x4 Post Base 10 Pcs, Inner Size 3.6"x3.6" Post Base Brackets,Heavy Duty Powder Coated Post Anchor Matte Wood Post | Black | Best Buy