The width of single sluice grizzly bars is 60 cm
For the time being of 2018 and begin of 2019, in the program Start Your Own Gold Mine we are using single sluices with the width of 60 cm. On the picture one can see the measurement of small grizzly bars and that the final width is 60 cm. The length of such classifier may be about 60 cm to 100 cm, that is matter of decision and estimates.
Classifier like this can have bars as small as 4 mm diameter.