Atlas Sound AD-11BSurface Mount Female Mic Flange 5/8-27 Thread is a 5/8"-27 female flange with 1-3/4" base diameter; chrome or ebony (E) (Net Weight: 1 oz.) It is designed with duarbility for use in Touring P.A. Applications. Its quality assures a life long use and assures compatibility. U. S. Standard 5/8"-27 Termination Accommodates All Types of Microphone Holders.