You will receive model in .zip format which is included STL, OBJ, STEP format.
If you want to make changes on the ring I can also send Rhino software file.ABOUT THE RİNG
Size: Inside diameter: 17mm. Approximately US 6.5 size / Europe 53 size. / UK M 1/2 size. You can see the dimensions on the photo.Currently I don't provide resizing and customer order.