I've found my Harley tool kit covers most repairs;4" crescent wrench on my keyring,5" vise grips with wire cutters and my Buck 110 lockblade knife/hammerin my knifecase on my belt. I also carry a mini-mag in my pocket cuz it's hard to wrench and keep a BIC lighter going while working next to the highway at night.
And they don't care if it's metric or not.
Speed


1954 GMC 350
1957 GMC 1/2 ton
1962 Chevy C-30
1952 Chevy 6400 dump bed project truck
'98 Harley FLSTC
'66 Pontiac Catalina
'76 Chevy 1 ton Duallie
'84 Bronco II
'78 Dodge W-200
'81 Toyota 4X4 truck