This mount is for the BigTreeTech PiPad 5 Display, which is capable to mount a Raspberry CM or similiar modules like the BTT CB1.
Pls consider, that it is made for der V2 350 - it fits with the standard skirts.
For other sizes you may need to modify the skirts. Anyway it should fit tight when replacing the mini12864 case components.
The author hasn't provided the model origin yet.