Opening diameter of conference handheld microphone

What is the opening diameter of the hand-in-hand microphone at the press conference? The opening diameter of the microphone is 450 mm

According to the information released by the hand-in-hand microphone supplier, the hand-in-hand conference discussion system includes the chairman's spokesperson, the vice chairman's spokesperson, the representative spokesperson and the conference host. Microphone diameter is 450mm, and the installation method is embedded. The microphone size is 120×44×90mm, and the opening size is102× 36 mm. ..