They fit the end of 2 1/4" square tubing in both 12 and 14 gauge as the inside diameter is the same for either wall thickness of tubing. They seal well.
π© Enhanced Durability and Stability: Outside Joining Aluminum Profile Bracket
8 Review
Stainless Steel π© Fastener Hardware by BIGTEDDY
9 Review
πͺ Enhance Stability and Aesthetics with Alamic Corner Stainless Bracket Braces
9 Review
Stainless Steel Bracket Shelves: Industrial Hanging Hardware
8 Review