There should be a very small staple on the loop. It usually goes through a working metal detector (the detection setting is higher than the airport) but it does work from time to time and when they get me out it buzzes right on the loop.
Pros
I bought it for my husband for a flight, metal detectors went through 2 times with no problems. Well made belt.
Cons
My husband loves it but the buckle broke after a few weeks. We are currently waiting for a replacement.