The 1-5/8″ (1-11/16″ OD outer diameter). Chain link fence pipe. The 1-5/8″ (1-11/16″ OD outer diameter) pipe is slipped inside the footpad. Footpads allow for a secure anchor base in setting up a frame tent or carport. Extremely durable rust-resistant powder coated steel construction with strong welded connections. Holes in base to be staked to the ground, or bolted to concrete or asphalt surfaces.