Specification: Frame Material: ABS Plastic Mesh Material: Cold Rolled Steel Outer Diameter: 169mm / 6.65 inch Inner Diameter: 119mm / 4.69 inch Screw Hole Diameter: 4mm / 0.16 inch Diagonal Center Hole Distance: 136mm / 5.35 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.