54mm
I believe that is 18 mm.
21mm socket or wrench
Spark plugs use SAE and not Metric. The one that fits it is the one that fits it.
1 11/16 in
It will be a metric size try different sizes until you find the one that fits.
42mm is a standard socket. If you mean "what SAE socket fits," none of them do. BTW, what are you trying to get off that's got a nut that big on it?
The part of the tooth that fits into the socket of the jaw(mandible) or maxilla(for upper teeth) is the "root" of the tooth.
The size that fits your wheel nuts. -There are only 4 basic sizes, it can't be that difficult to figure out !
If it has the hex bolts, find a hex wrench that is the right size, cut the wrench approx 2 inches long and find a socket that fits the hex. You can attach your torque wrench to the socket. Been there did that.
Fits socket 7 boards.
Socket
Any battery socket that it fits.