Store › 3" x 3" Galvanized Square Tube - 11 gauge - A500 Image 1 of 2 Image 2 of 2 3" x 3" Galvanized Square Tube - 11 gauge - A500 from $42.75 OD 3” x 3" - ID 2-3/4” x 2-3/4” - Galvanized Square Tube - 11 gauge (1/8” wall thickness) - Grade A-500 Length: Select Length 12" 24" 36" 48" 60" 72" 84" 96" Quantity: Add To Cart Added! OD 3” x 3" - ID 2-3/4” x 2-3/4” - Galvanized Square Tube - 11 gauge (1/8” wall thickness) - Grade A-500