Store › 1/2" Round Tube - Mild steel - ERW - 16 gauge Image 1 of 1 1/2" Round Tube - Mild steel - ERW - 16 gauge from $4.00 OD 1/2” - ID 3/8” - Round Metal Tube - 16 gauge (1/16” 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 1/2” - ID 3/8” - Round Metal Tube - 16 gauge (1/16” wall thickness) - ERW - ASTM A513 - Mild Steel - Cold Rolled