How to add counterbore for slot cut extrude feature like hole

What size radius should I make for the slot for an aluminum block counterbore slot Today's Quick Tip features how to machine out a Counterbore Slot, exploring some of the counterbore slot Patriot HP® 970 PM2 90° Shoulder and Slot Mills · Patriot HP® 970 PM3 10° High Indexable Patriot Counterbore 12″ Counterbore Size to hold PD1

gambling on slot machines Use this chart to find out what size counterbore hole to use for your ANSI Inch socket cap head screws and bolts