NAPA Auto Parts, Model #NBD 620 5/8” 6 Point 3/8” Drive Deep Socket

This may look like a sparkplug socket, but it's not. I was confused for a while until researching the issue. When this model was made, the sparkplug version of this product as NAPA item #NBD 620S. In fact all of these deep sockets from NAPA had the added "S" on the end of the model numbers to differentiate their deep sockets from the sparkplug variations.