Crown Board Holes

[Black Comb]

I'm making up a few crownboards and wonder what is the optimum hole size?

the ones I bought with my well-used hives have different sizes.

I usualy use rapid feeders so I'm guessing 60 or perhaps 70mm are OK.

Once I decide I'll buy a "hole saw" of the correc dia. with arbor.

Thanks

 

[mark s]

hi peters
all my boards have a 65mm hole which seems good enough for most apps

 

[jezd]

hi peters
all my boards have a 65mm hole which seems good enough for most apps

in old money mine are 2.5"

 

[Black Comb]

Thanks folks.
60 - 65mm it is then