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When choosing aluminum end mills, the following factors need to be considered:

1. Tool material: The tool material for aluminum end mills should be high-speed steel or solid cemented carbide. Both of these two materials have excellent hardness and wear resistance, which can enhance cutting efficiency and cutting quality.

2. Tool structure: The structure of aluminum end mills should be double-edged or multi-edged, which can enhance cutting efficiency and stability.

3. Tool shape: The tool shape of the aluminum end mill should be a straight shank or a conical shank, which facilitates clamping and replacement.

4. Tool size: The size of the aluminum end mill should be selected based on the size and requirements of the workpiece to be processed. Generally speaking, aluminum end mills with larger diameters and more teeth can improve cutting efficiency and quality.