To use the wall mounting device you must first remove the face plate that covers the hole for the screw. That is the thin round coin shaped piece of metal that sits on one side of the device. Determine how many WMD's are necessary to keep your piece firmly mounted to the wall. For larger pieces you may want to use up to four WMDs. They can be placed on the bottom, side and top of your piece. For basic shapes like squares and circles we recommend two WMD on the bottom and two on the top. Drill holes in the wall where you would like to place your WMD and secure them with a screw. Place your piece into the WMD devices and further secure the piece with the set screws. You can use the small hex wrench provided to tighten the set screws until they are snuggly fit against your piece. If your piece is made with thinner glass we can send out longer set screws upon request. After tightening all of your set screws you can then stick the face plate back onto the WMD using the double sided sticky tape.