The Audio2000'S AMC4141 3-pack microphone holders are configured with the flexible and strong soft plastic high quality material. The tapper dimensions of each of the AMC4141 microphone holders are from 25mm to 19mm (front opening: 25mm, about 1 inch; the rear opening: 19mm, about 3/4 inches). The AMC4141 are designed to hold your microphones securely and easily with 5/8" X 27 metal threads. Also, the AMC4141 microphone holders can have the tilt angle adjusted easily for your microphone placement conveniences. Three 5/8" male to 3/8" female adapters are included for the microphone clips to be used with the stands configured with the threads with the 3/8" diameter.