SEPPI M. - stone crusher MIDIPIERRE way - new video!!Aug 4, 2009 . (EN) This new video shows the stone crusher MIDIPIERRE way. It crushes stones as big as 15-20 cm [6-8"] in diameter, according to the stone.tractor mounted stone crushers,Stone Crushers - FAE GroupStone crushers with a max working depth of 15 cm/6'' for tractors . and crushing capacity up to 50 cm/20'' of diameter for tractors between 180 and 300 HP.