



 
Hi Phil, The wrenches measured in millimeters are not exactly the same size as the wrenches measured in inches so the best you can do is an approximation. One conversion factor I carry around in my head is the 2.54 cm = 1 inch. There are 10 millimeters in a centimeter so 25.4 mm = 1 in. If you divide both sides by 32 you get
thus
This may be what you need. 7 × 8 = 56 and hence 7/32 in is approximately 5.6 mm 3/16 = 6/32 and 6 × 8 = 48 so 3/16 in is approximately 4.8 mm. I hope this helps,  


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