Hi mftha,
The closest that OP has to a 4" opening is their plate used for large bits & raised panels. It has a 3 1/8" opening, unfortunetly, if you're wanting to get bushing guides that large, you'll have to machine them yourself or have a machine shop do them for you. Preferrably from brass stock.
Sad truth is, unless all State Senators are informed for the push to (as Harry calls it), "metrication". It won't happen. Thus how things are now, a mixed batch of metric & SAE sizes.
__________________
Ken
"A VETERAN"
"Whether active duty, retired, national guard or reserve - is someone who, at one point in their life, wrote a blank check made payable to "The United States of America", for an amount of "up to and including my life". That is HONOR, and there are way too many people in this country who no longer understand it." -Author Unknown
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