Okay, I emailed Lee and this is the reply:
Jeri @ Lee Precision, Inc.
Staff - 05/26/2022 10:44 am
Hi Kees,
Thanks for reaching out! I did some looking into it. The 90454 has a diameter of .530
Let me know if I can assist you any further!
Thank You,
Jeri
Customer Service
Lee Precision, Inc.
4275 County Road U
Hartford, WI 53027
So now we know.
~Kees~