This is a snap button. It has other name, stud button. 3d printable model attached. Editable IGES file format also attached. The size os T5 (12mm dia). You can scale it as you need. You need a plier press tool kit to insert the button.
You can use it in kid's clothings, wallets, shoes, begs, leather begs and other purpose.
Custom size and design possible, you have to contact with me for more details.
Thanks,Mahbub