Speaker Grill CoverProduct Details1.Screw Hole Diameter: 4mm / 0.16 inch; Diagonal Center Hole Distance: 167mm / 6.57 inch2.Outer Diameter: 185mm / 7.28 inch; Inner Diameter: 146mm / 5.75 inch3.Frame Material: ABS Plastic; Mesh Material: Cold Rolled Steel4.Distribute screws, make you more convenient installation.Great for speaker cabinet, home speaker or speaker.5.Note:Please measure the diagonal distance of the speaker mounting hole before purchasing.