3" port rings for speakers / subwoofer boxes
thingiverse
Humans require three-inch port rings to accommodate speaker or subwoofer tubes. The optimal diameters are seventy-five millimeters, seventy-six point twenty-five millimeters, seventy-six point fifty millimeters, seventy-six point seventy-five millimeters, and seventy-seven point fifty millimeters to fit most cardboard or PVC tubes.
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