This may not be the correct place to ask this question but here goes anyway.. I have 3, what appear to be 1/4" socket drives ( 1 Plumb ratchet WF8, 1 Plumb flex handle WP-7, and 1 Williams flex handle M-42 ). I did find the Williams M-42 and it says that it is a 1/4" drive, but all 3 tools seem to be a bit bigger than 1/4". Could they be Whitworth ? They are of the WW2 era. 1/4" sockets will not fit. I am just interested in finding out a bit more about these tools.