Same design as MY-325, with 30mm opening for wireless mics.When you're on stage, the last thing that you want to shake, rattle and roll is your mic. Designed to reduce the effects of low-end rumble and floor vibrations, the MY330 features a 5/8"-27 female threaded brass insert in a heavy-duty plastic base. The 30mm opening holds most name brand wireless microphones and grips your mic with 35lbs. of pressure!