We manufacture all of our fittings to produce top quality products at a below list price. We made this specialty 1 3/8" L-shaped thru fitting with high grade galvanized steel for unfailing strength and support. Welded connections and eyebolts provide for a snug, secure fit. The inner diameter of this L-shaped fitting is 1 3/8". Ensure your storage or shade structure lasts as long as your needs.