An angle grinder is a power tool used in metal fabrication work, including cutting, grinding, deburring, finishing, and polishing. Angle grinders operate electrically; Either wired or battery powered. Each abrasive grain on the surface of the wheel cuts a small portion of the workpiece by deforming the shears. The herb grinder is used to break up marijuana buds, which makes it easier to roll the medicine onto the paper. The angle grinder is useful for cutting tiles, bricks, granite, marble and other materials.