15x10 aluminum slots: Cross slot pan head screw with drill tail self-tapping screw | ... . Aluminum Profile 160x160 T-Slot XIAMEN VICTORY ALUMINUM. US Mag Wheels Bonneville U435 - Pro Performance.
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This is a vintage US Mag Indy slotted mag that was released in '67'68. It was produced in 15x4.5, 15x7, 15x6 (very rare), 15x8.5, 15x10, 15x12, and 15x15 sizes.