We have these counterbores custom made for us by one of the top tooling manufacturers here in the USA.
These are a solid pilot TiAln coated solid micro grain carbide counterbore. They are built to work with our 1-72 short socket head titanium screws.
These are tighter than a standard #1 counterbore and will leave a .005″ clearance around our screw heads for a clean precision fit and look…
TIP: Do NOT clamp down the part you are counterboring. These do not like to flex . Hold your part free and you will get awesome results. We have counterbored hundreds of holes and are still using the very first one we ever bought!!!