Counterbored screw slot router bits

When creating a Counterbore hole it does not matter which hole you cut first when using CADD software When cutting a real Counterbore hole in a piece of

The callout displays all slot-related dimensions that are marked for drawing, plus the THRU-ALL note or depth symbol value if the slot is through or blind

counterbore slot callout How Are Spotfaces Shown on Drawings? An example of a spotface is shown below, the dimensioning is very similar to a counterbore Spotface Engineering Drawing

pearl diver slot Slot length on the holeslot symbol or machine hole callout Shown here Hole information for a counterbore hole is shown on a miscellaneous member detail