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68 mm Bolt Circle Diameter, 4-bolt chainrings

68 Bolt Circle Diameter (BCD) 4-bolt chainrings on this page:
Quality Bicycle Products: 22-tooth

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Bolt Circle Diameter is the diameter of the circle formed by the centers of the chainring fixing bolts. With 4-bolt cranksets, this is easy to measure. 5-bolt cranks are more difficult.

If you are unsure about what size chainring you need, Wolf Tooth Components has an excellent guide to measuring your rings.

Quality Bicycle Products 22-tooth, 68 BCD 4-bolt chainring. New, $25.00

Part# 62218

Quality Bicycle products chainring

The data is all engraved.

QBP ring

And the flip side. That is not a painted ring just outside the bolt holes. It is a recessed portion of the chainring reflecting the light.