After receiving your aluminum profiles, follow these steps to make sure they meet your specifications: 1. Check for any visible damage such as dents, scratches or bends. Ensure consistent surface finish and no defects. 2. Measure the dimensions of the extruded parts to confirm that they meet the specified tolerances. Use calipers or other precision measuring tools. 3. Confirm that the quantity of extruded parts received is in accordance with the order. 4. Check the surface for signs of chromatic aberration or contamination. If you notice any discrepancies or problems, please contact supplier immediately to resolve the issue.