Genmitsu 65mm Diameter Aluminum CNC Spindle Holder Spindle Mount for Genmitsu 4040-PRO, 3020-PRO MAX V2, 3030-PROVer MAX CNC Machine and Genmitsu Aluminum Z Axis Assembly V2 Kits - Amazon.com
Aluminium - Wikipedia
Aluminum Channels: Types of Channels, Finishes, Types of Aluminum, and Characteristics