uxcell Sliding T Slot Nuts, M4 Half Round Roll in T-Nut for 4040 Series Aluminum Extrusion Profile, Carbon Steel Nickel-Plated, Pack of 10: Amazon.com: Industrial & Scientific
E45-4545HR-C 45mm x 45mm Half Round Extrusion(Cut To Length)
aluminum machining round tube processing by aluminum profile cad vs aluminium alloy Customized Anodized Factory - Made in China - Pailian Aluminium