What size thread are the spike holes in RF-3 II

[wired4sound]

That is my question. I want to buy some spikes for when my speakers arrive. Five points for the correct answer.

[macaltec]

1/4-20 UNC is my guess. Too lazy to actually get up and check.

[colterphoto]

go to hardware store and get a bolt to check before you order spikes. Or order directly from Klipsch 1-800-554-7724 Parts