Specification:Frame Material: ABS PlasticMesh Material: Cold Rolled SteelOuter Diameter: 153mm / 6.02 inchInner Diameter: 120mm / 4.72 inchScrew Hole Diameter: 4mm / 0.16 inchDiagonal Center Hole Distance: 137mm / 5.39 inchPackage Content: 2pcs x Speaker Grill with ScrewsDescription:Distribute screws, make you more convenient installation.Great for speaker cabinet, home speaker or speaker.Protect your Subwoofer from cuts, rips, tears and dents.NOTE:Please measure the diagonal distance of the speaker mounting hole before purchasing