I designed this to fit the components from a "GMYLE (TM) Wireless Charging Pad Powermat Mat Charger". Other models may or may not fit. I suggest you download the model and double check all measurements!! See http://forum.xda-developers.com/showthread.php?t=2335769 for more information. If you are to place this on a metallic/conductive surface please ensure the bottom is covered with some insulator, for example: a transparency sheet.
You may also get the optional part "Nexus 4 Qi Charging Dock Lens" http://shpws.me/oi3J that goes with this dock.