Air Angle Die Grinder Click HERE for more information! The 90-degree head allows flexibility in many applications for reaching tight or angled grinding, easy to access to small spots. It is equipped with a 1/4" collet and a 1/8" collet, so you can grind, break sharp edges, deburr, port, and polish virtually anywhere! It also features an integral safety-lock throttle lever, preventing accidental start-up. Note: Please remove the DUST PLUG before inserting the air connector.