Specification: Frame Material: ABS Plastic Mesh Material: Cold Rolled Steel Outer Diameter: 95mm / 3.74 inch Inner Diameter: 72mm / 2.83 inch Screw Hole Diameter: 4mm / 0.16 inch Diagonal Center Hole Distance: 84mm / 3.31 inch Package Content: 1 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.