SmallRig Top Plate for Sony FX3 / FX30 XLR Unit MD3990 SmallRig Top Plate for Sony FX3 / FX30 XLR Unit MD3990, is designed to protect the audio unit of the Sony FX3 / FX30 XLR handle. It can be attached either via the adapter on the top of the handle, or via a 3/8 inch 16 screw on the Sony FX3 / FX30 XLR Handle Extension Rig MD3490. It fits perfectly on the top of the Sony FX3 / FX30 XLR unit with built-in pads for full protection, also equipped with multiple 1/4 inch-20 threaded holes and a built-in accessory mount for attaching other devices, such as a microphone, LED light, etc.