Q. Is 5mm the same as 1/4 inch?
5mm = just over 3/16 inch. 6mm = almost 1/4 inch. 7mm = almost 9/32 inch (= a bit over 1/4 inch) 11mm = almost 7/16 inch.
Q. What is 21mm in standard?
Metric / Standard Wrench Conversion Chart
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