Ingersoll Rand 301B Air Die Grinder SetIngersoll Rand Air Die Grinder Set Long lasting, economical, and ideal for general purpose grinding, the 301B delivers a number of beneficial features in one compact package. Right angle configuration provides easy access to tight spots, so you can grind, break sharp edges, de burr, port, and polish virtually anywhere! Features include 21,000 RPM 1 4" Collet 1 4" air inlet 0. 25 HP Front Exhaust 24 CFM Kit includes Die Grinder 1 4" Collet Insert 6mm