Review on Sunex 884504: High-Quality 3/8-Inch Drive Thin Wall Spark Plug Socket - Metric CR-MO Construction by Mark Gancio

It would probably be a very good head for its purpose if I could read the size in millimeters correctly on the rosette in the promotional photo. What appeared to be 18mm (needed) is actually 16mm. Nowhere in the announcement was the actual size of the outlet mentioned. Full confidence that the specification in the photo is made. Well, for the price, I'll keep and toss in a tool chest for possible future need - there are never enough suitable tools or I can't find them.