We bought pallet loads of motorcycle parts when Dixie International went out of business. There was a box of the spark plug wrenches. We are selling them in lots of 10. Took a metric tape measure and the one side has 21 mm going directly across and the other side is 26 mm directly across. The overall height of the wrench is about 4 and 1/2 in. I assume these are new but they were not in any packaging so they've been banging against each other for decades. There's going to be some minor imperfections on them.