Normally, you won't order this item separately. Instead, choose it from the "Attachment" or "Mounting" options when you order a keyguard. Order it here only for those keyguards that don't show Attachments or Mounting, or if you need to add it to an existing order that has not yet been processed.
The top flange attachment is a second piece of acrylic which is bonded to the keyguard and rests on top of the case. It strengthens the keyguard and provides a flat surface for mounting. It is typically secured with self-adhesive Velcro. On cases with a smooth, flat bezel it can be secured with suction cup tape, which keeps the keyguard closer to the screen.
Quickest way to detach and reattach a keyguard for a user who uses more than one app.
Strengthens the keyguard considerably.
Can be added to a keyguard retroactively in some cases.