Specifications 50 Goldwood Sound SG-M4 Black Metal Steel Mesh Snap On Grills Heavy Duty De-burred Steel Grills Fits Most 4.5 Woofers Each Comes with one Mounting Ring with Multiple Hole Patterns and one Snap On Mesh Grill Mounting Hole Patterns of 4.9375 4.75 and 4.625 from center to center across Overall Measurement of 5.4375 Round and .4375 High Requires Flat Head Screws that are NOT Included Designed And Engineered In USA Applications: Speaker Cabinet Home Speaker Car Speaker This Listing and Price is for 50 Grills