Several adapters to fit the Router bit organizer from Sautershop.

Here the link for the organizer: https://www.sautershop.com/router-bit-organizer-c03-51-ak-c03-51-0106

sizes: 

outside diameter: 21.8mm

• 12,9mm x 12,9mm
• 11,75mm x 9,0mm
• 13,75mm x 10,75mm