Outside Dim of shaft Collars

What is the Outside Dimension of Shaft collars?

https://www.robotshop.com/en/vex-shaft-collar-16pk.html?gclid=CjwKCAjwndvlBRANEiwABrR32AdQRats1wMzopzo3Msh7GfA3OLND4sA4xiYvm4iDOAz86glALxm-RoCDO8QAvD_BwE

Hi,

The outer diameter of the collars is 11.1mm and the thickness is 6.4mm.

Cheers