something's fishy...

[@ronwade5646]

British Standard or Whitworth. The 5/8 is one flat side, one flat side is 1/2 inch use Whitworth 1/2 inch

[@dmurphy5348]

It’s a refrigeration wrench for flare fittings it’s measure stamped at size of line ran not nut size

[@PastPreserver]

@@dmurphy5348 Cool thank you I didn't know that's what it was for that makes more sense. 👍

[@L_S73]

I ha e a couple of those brand wrenches. I'll have to check if they are marked like that

[@trainnerd3029]

I’ve had a couple of these in my toolbox for 20 years and never knew why they were stamped like that… Thank you!

[@sirlevi405]

Nut Size ❤

[@PastPreserver]

@@trainnerd3029Cool I have had a few other comments and I think they are correct with the size being the Witworth British standard

[@Andy47357]

its the side of the threads/ fitting not the size of the actually head of the fastener

[@truthteller3288]

Some old wrench didn't measure the head of the bolt but the threaded part of the bolt. So that 1/2 is actually 3/4 .

[@sqike001ton]

Whitworth

[@andrewmcalwee1716]

That's what size bolts they are used for.

[@nic9061]

I can’t understand a damn word on this

[@aaronpolekoff3311]

Or British standard

[@PastPreserver]

@@aaronpolekoff3311 ohh I think you are right I looked that up and found Withworth sizes that are the same as this thank you

[@gn8713]

Made in China

[@kmoecub]

Nope. Made in England.

[@gn8713]

​@kmoecub it's a joke🤦‍♂️🤦‍♂️