It is the half of a sum. (0.5 is enough.)
It has something to do with carrying an illegal concealed firearm. Most concealed gun laws I've found have a -050 ending.
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it means stay fresh
.050 inch.050 inch
316/.050 = 2320
.125 is thicker than .050
.050 inch.050 inch
If you mean: 0.50 then they are 1/2, 2/4 and 3/6