These bulldog clips are very strong and sturdy with a giant magnet on the back to attach to fridge.
A 38mm button back has been professionally machined to the clip and included is the front 38mm shell also.
All you have to do is push the button in with fabric (like our attached snap clips) and all done! (please note, you don't need to use the blue pusher, just use your fingers).
Photo credit to Kazah Buttons + Accessories for the gorgeous animal bulldog clip photo!