Frame Material: ABS Plastic;
Mesh Material: Cold Rolled Steel
Outer Diameter: 153mm / 6.02 inch;
Inner Diameter: 120mm / 4.72 inch Screw
Hole Diameter: 4mm / 0.16 inch;
Diagonal Center Hole Distance: 137mm / 5.39 inch Screws are distributed for easier installation. Ideal for speaker cabinets, home speakers, or general speaker use