On-Stage MA-300 5/8" Male to 3/8" Female Knurled Mic Screw Adapter, 2 Pieces MA300 features 5/8" male to 3/8" female for use with mic stands with European 3/8" threads. Knurled outer flange for ease of tightening. MA300 features 5/8" male to 3/8" female for use with mic stands with European 3/8" threads. Knurled outer flange for ease of tightening. MA300 features 5/8" male to 3/8" female for use with mic stands with European 3/8" threads. Knurled outer flange for ease of tightening.