However, I thought I read in the comments that this was the same but with a different packaging ... I'm not so sure.
I bought these for the Kidde fixings and it works well despite my fear when bonding with the detector.
Indeed, the alarm is an hollowed disc in its center necessarily so did not stick to the entire surface but only on a ring. But this does not affect the quality of this attachment because it would rather the Kidde would be poorly thought.
And it fits very well anyway, so no regrets.
Do not hesitate to pay less!