I bought this for my Casio LA670 watch because the original strap broke. I think my watch strap is 12mm, but this 13mm fits perfectly. Tip: The instructions say to insert the pins and then slide the watch up the strap. I felt this would be an unnecessary hassle and could bend the velcro making it less effective. Instead, I positioned the watch where I wanted it on the bracelet and then stuck pins across the top of the bracelet. It worked great. (If you can't find the pens, look in the box. I knew the pens were hard to find in the box based on other reviews, but at first I really thought the pens were left out. But they were there.) I bought this strap to keep track of my whitewater kayaking PfD and I think it will work great for that. It feels a little bulky on the wrist, but I have tiny wrists so this might not be an issue for others.
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