Understanding Counterbore Dimensioning

Counterbore callouts from OPPOSITE SIDE counterbore slot callout or if not, what is a better way to make the callout? Should I lay a center mark on the curved slot center, give it a radius dimension, counterbore slot callout What Tools Are Used for Counterbore Holes? Making the Correct Tap Selection for a Counterbore Hole What is Counterbore Callout Symbol?

oud slot Looking for Counterbored screw slot router bits ? You will find them in the Industrial router bits section of the CMT Orange Tools website