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Check the listing for details. DIY 90 Degree 3MM Pneumatic Micro Grinder Angle Air Micro Die Grinder Set Tool #. Condition: New. Listed at 83.01 USD. 1 x Micro Air Die Grinder. Air inlet thread: 1/4-28UNF. ● Depending on the difference of material to decide the depth. The color may have different as the difference display,pls understand. Free speed: 70000 rpm.