The die grinder belongs to Kris Coward. It has a 2.0A motor, and came with a collet which allows it to accept tools with a 1/4" shank. Kris has also fabricated a collet which allows it to accept tools with a 1/8" shank. The burrs and other tools in the grinder box also belong to Kris and are semi-consumable. If you wear one of the tools out (or wear it down significantly), replace it.