Store › 2-1/2" Round Tube - Mild steel - ERW - 11 gauge Image 1 of 1 2-1/2" Round Tube - Mild steel - ERW - 11 gauge from $30.50 OD 2-1/2” - ID 2-1/4” - Round Metal Tube - 11 gauge (1/8” wall thickness) - ERW - ASTM A513 - Mild Steel - Cold Rolled Length: Select Length 12" 24" 36" 48" 60" 72" 84" 96" Quantity: Add To Cart Added! OD 2-1/2” - ID 2-1/4” - Round Metal Tube - 11 gauge (1/8” wall thickness) - ERW - ASTM A513 - Mild Steel - Cold Rolled