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GRAV Labs Grinder 3 Piece 1.25 The GRAV� Grinder is 1.25" tall and made on CNC aluminum. The 15 teeth and holes in its upper chamber are well-spaced to prevent clogging. Its bottom chamber features a magnetic kief screen that can be removed for easy scraping using a GRAV� branded aluminum scraping tool. The edge of the tool is curved to perfectly fit the interior curve of the grinder.