The Iris Rim Template 2 pack includes:

• (1) Iris Rim Template (9.5") - compatible with OG Rounds, OG Slim Rounds, and RD2 Rounds sized 9.5" or less
• (1) Iris Rim Template (12.5") - compatible with OG Rounds, OG Slim Rounds, and RD2 Rounds sized 12.5" or less

Compatible with OG Round, OG Slim Round, and RD2 Round Forms sized 8.5" or less. 

All Rim Templates are measured in inches.

GR Forms Rim Template Tutorial: https://www.youtube.com/watch?v=XGcSSF-cYmw

How to Precut a Slab using a Rim Template: https://grpotteryforms.com/blogs/tutorials/how-to-precut-a-slab-using-a-rim-template