SCHOEPS SG 20 Stand Adaptor. For 20/21mm diameter cylindrical microphones from SCHOEPS. 
Flexible thermoplastic clip with machined brass base. 5/8" female thread for standard microphone stands and includes a 3/8" or 1/2" threaded insert. 
 
Use with: SCHOEPS CMC 6 / 5 / 4 / 3 / 1 U, MiniCMIT, CMIT 5, SuperCMIT, CMD 42, MSTC 74