I ordered a 19mm inner loop but received a 20mm loop. I'm sending it back and ordered 18mm hoping it works. The loop is soft and slides easily over the watch strap clip, so I don't think I'll need to use the included tool to remove the strap. I returned the first and second order but the third (16mm) was the right size. I used this tool to reattach my old watch band and it was very, very helpful.
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