Specifications:Frame Material: ABS PlasticMesh Material: Cold Rolled SteelOuter Diameter: 96.7mm / 3.81 inchInner Diameter: 79mm / 3.11 inchScrew Hole Diameter: 3mm / 0.12 inchMounting Hole Distance: 88mm / 3.46 inchFeatures:Great for speaker cabinet, home speaker or speaker.Protect your Subwoofer from cuts, rips, tears and dents.DIY speaker grille, suitable for DIY speakers and cars speaker decorative circle.Package Includes:1 x Speaker Grill Cover