There are a plethora of binding post styles out there.
Some manufacturers have their own
design of tightening tool, or design their posts to be
finger-tightened only. Many 5-ways have a hex type
tightener/nut. ie: I have always installed Vampire 5-
ways(BP-HEX),
on my amps and speakers, which take a 7/16" wrench. An
ordinary open-end wrench will provide more than enough
purchase, to obtain a gas tight connection, with any decent
hex 5-way. It's easy to over-torque a speaker post and spin
it(in it's mount), so- proceed with caution.
Some manufacturers have their own
design of tightening tool, or design their posts to be
finger-tightened only. Many 5-ways have a hex type
tightener/nut. ie: I have always installed Vampire 5-
ways(BP-HEX),
on my amps and speakers, which take a 7/16" wrench. An
ordinary open-end wrench will provide more than enough
purchase, to obtain a gas tight connection, with any decent
hex 5-way. It's easy to over-torque a speaker post and spin
it(in it's mount), so- proceed with caution.