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Anyone know if these are better at forming the requisite square recesses
for square plugs than a hollow chisel (from a mortiser)? I have an old
set of hollow chisels that I use for such a task (smack with a mallet).

trying to determine if the cost can be justified here considering that I
own a few hollow chisels.

Are they easier to use for this task? Do they produce a better quality
hole (no chipping - perfectly square)?

Surely this is the exact purpose for which bevel edged and mortice chisels
have evolved over the last hundreds of years?