In the automotive field, 12 mm ,14 mm & 17 mm wrench sizes are common on Japanese vehicles while domestics use 13 mm, 15 mm & 18 mm alot. I've used metric so much for so many years, I prefer it.
Sent from my iPhone when I should be working.
japs are smarter,they shave weight and material cost using 1mm smaller hex.europeian manufacturers are heading this way slowly.hoping poo has fired the crew who picked bolt sizes and bolt types on 05-10 sleds.those were a nightmare.