R&A Rules
🏛️Official — R&AThe Hole (Rule 13.1)
Verdict
The hole on the putting green must be 4¼ inches (108 mm) in diameter and at least 4 inches (101.6 mm) deep. If a lining is used, it must be sunk at least 1 inch (25.4 mm) below the putting green surface, and its outer diameter must not exceed 4¼ inches (108 mm).
Send this to your friend — argument over.
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