6 millimeters is already rounded to the nearest thousandth of a millimeter.
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For example to round 1.465 to the nearest hundredth you look at the thousandth (5) if it is bigger than 5 then you round the hundredth (6) to 7. So your example answer would be 1.47
8.660
one-sixth as decimal nearest thousandth = 0.1671/6:= 1÷ 6= 0.167 in decimal
12.66
17.856 rounded to the nearest hundredth is 17.86. The digit to the right of the hundredth is the thousandth. When rounding anything less than five you round down. When rounding anything five or more you round up. The thousandth digit is 6, which is more than 5, so you round up, making the answer 17.860 or 17.86.