2 Pack - 2 inch round metal jack plates for speaker cabinets. Gloss Black Finish. <P>For use with 1/4" USA made jacks with standard 3/8" -32 Threads or 6.3mm Metric Jacks. <P>Requires a 1-1/16" to 1-1/4" mounting hole. Will sit very nearly flush with a 1" mounting hole.