Neewer&reg; 2 Pack 5.9"/15CM Steel Stereo Microphone Mount Bracket Bar T-bar with Dual Microphone Clip Holders, Fits Stands or Booms with 3/8 Inch-16 Threads Constructed with heavy-duty steel,solid and durable.Fits stands and booms with 3/8"-16 threads. Please check the thread size of your stand or boom before ordering. With four 3/8" threaded screws. Holds up to four microphones.Comes with 4 mic clip holders for most handheld microphones.1.1" diameter opening tapers to 0.9" Four 5/8" male to 3/8" female microphone screw adapters come attached on the mic holders Note:Stand,Boom,Microphones and Butterfly Clip NOT INCLUDED.