Loosen or tighten your spark plugs with this handy tool.
Is this for 7/8 spark plugs?
No. They will work on 5/8" plugs which have 3/4" mounting nut.
Part number 13-03921 spark plug wrench: will this fit a 7/8" plug? If not, do you have one that does?
This wrench has 13/16" & 3/4" size ends. We do have a socket for spark plugs. P/N 12-01693 with a magnet or 12-00710 without a magnet will work for 7/8.