I tried another strap and it just pushed the rubber back on my M2 frame and so didn't work for them. So after looking for the M2 frame straps and finding this one, I was relieved. They snap right into the holes on the M2 frame arms and have worked great for the past few weeks. The sales photos do not show the connector but to make it clear for everyone and the reason I am writing this review is that it is a small plastic connector that goes straight to the frame. Therefore, the temples of your glasses should have holes to connect them. They will not work on disks without holes. For my comfort, I set them to the maximum length, and I'm comfortable with that length. I use mine to protect my eyes in operating theatres, so it's good to have them around when needed.
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