In original condition.
Last 2 photos are for illustration only and are not included parts.
Price is for one.
Outside diameter is 4-9/16", inside diameter is 2-1/4".
Screw holes are  4-9/16" spaced apart on centers.
The screw holes make a 3-5/16" diameter on centers.

Has an up and a down way of mounting.
Is used to secure a 3" square Technics tweeter / midrange driver onto the speaker box.
If you need more, please see my other matching parts.

3290-2