Counterbore Drill Bit -

It's called a counterbore slot because a counterbored hole is a hole with a recess that allows the head of a screw (other than a flat head

Use constraints to make the slot's end arcs concentric with the counterbore's end arcs and constrain the sides of the slot to be tangent to

counterbore slot You can create counterbored, countersunk, and straight slots from the Hole Wizard Counterbore Slot, PM_HoleWiz_cbore_ Countersink Slot

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