It is a Ryobi grinder converted into a portable rock crusher. Ryobi grinder base is i... Rock Crusher/Pulverizer 12" x " Drum 2 HP electric or 6hp gas motor. 1, ... discs and lids for TM Engineering chatterbox pulverizer. Large Aluminum Alloy Mortar Pestle RockOre CrusherPulverizerGoldQuartz #4.