Woofer Guard ProtectorWhy Choose This:★Material - Frame: ABS Plastic; Mesh: Cold Rolled Steel★Protect your Subwoofer from cuts, rips, tears and dents.★Screw Hole Diameter: 4.5mm / 0.18 inch; Screw Hole Diameter: 108mm / 4.25 inch★Outer Diameter: 124mm / 4.88 inch; Inner Diameter: 93mm / 3.66 inch★DIY speaker grille, suitable for DIY speakers and cars speaker decorative circle.