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The Model 63, fitted with a 6" screen  being used to separate mountain river rock and dirt into under 6" and over  6" piles. The Model 63, when fitted  with 6" screens is factory approved to be used on materials including  rocks up to 175lbs. each,    (occasionally up to 225lbs.) on a  continuous basis. If smaller  opening/lighter screens are installed, rock size will be limited to account  for lighter wire in the screen.   The Model 63 is not factory approved  for use on any materials including rocks or similar materials larger than 225lbs.  
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