Heavy Duty Steel Speaker Tophat. 35mm Hole Diameter. 118mm Flange. 42mm Hole Cutting hole RequiredAccepts Pole Size: 35mm Flange Diameter: 110mm Depth: 106mm Hole Cut Size: 42mm Weight: 1.49g. A steel internal fitting for mounting loudspeaker cabinets directly on to 35mm stands and poles. It requires a 42mm diameter hole in the cabinet and fits a 35mm diameter pole. Steel construction for longevity with tough black finish and four fixing screws. The diameter of the flange is 110mm.. loudspeaker tophat-speaker tophat-speaker stand tophat