6061-T6 Aluminum Extruded ASTM B210, 4-1/2 Inch OD Round 4-1/4 "ID, 1/8 Wall, 8 Ft. Long : Amazon.de: Automotive
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6061T6 Round Aluminum Tubing | Aircraft Spruce
1 piece 2 mm - 6.2 mm ID 7 mm - 7.8 mm OD 6061/6063 aluminium tube alloy hollow aluminium hard pipe bolt 300 mm length (thread diameter: 7.5 mm (OD) x 4.1 mm (ID)) : Amazon.de: DIY & Tools