Specification: Frame Material: ABS Plastic Mesh Material: Cold Rolled Steel Outer Diameter: 124mm / 4.88 inch Inner Diameter: 92mm / 3.62 inch Screw Hole Diameter: 4mm / 0.16 inch Diagonal Center Hole Distance: 108mm / 4.25 inch Package Content: 2pcs x Speaker Grill with Screws Description: Distribute screws, make you more convenient installation. Great for speaker cabinet, home speaker or speaker. Protect your Subwoofer from cuts, rips, tears and dents.