Trying to remove a glow plug with a pair of needle nose pliers is possible but a glow plug wrench is specially designed for the purpose and can be easier to use (and you'll get a lot less grief from your dad or your wife or whoever you keep borrowing tools from). But don't think that just because it's called a glow plug wrench that you can't use it for other jobs as well.

As you'll discover, there are plenty of other ways to use that handy multi-purpose glow plug cross wrench -- even if the only RCs you have are electrics.