Function: 1 The 27mm ID x 32mm OD aluminum tubing has unmatched strength and is the largest diameter tube with the thickest wall 2. 27mm holes allow wire to pass through to maintain a clean look and protect the vitality of the robot 3. Create complex rotating components that are concentrated but independent from each other. You can also use the diameter of the hole to pass through the smaller diameter shafts and pipes 4. Practical and durable internal components for structural support and protection of robotics 5. Superior aluminum material is lightweight, superior strength, and has excellent corrosion resistance Specifications: Item type: Aluminum tube Model: 6100-2732-0150 Material: Aluminum Product Size: Outer Diameter: Approx. 32mm / 1.3in Inner Diameter: Approx. 27mm / 1.1in Length: Approx. 150mm / 5.9in Purpose: Used for robot engineering and internal component structural support and protection Package List: 1x aluminum tube