For wall tiles this works quite well and is a good, albeit very expensive, solution. There used to be only 4 common sizes of can lights including 6-7/8 inch. At present, all kinds of domestic and foreign manufacturers produce dozens of sizes for halogen lamps, PAR lamps, tungsten lamps, compact fluorescent lamps, and now LED lamps. Often you don't know what size hole to cut to attach the glass until you take it out of the box and look at the template inside. as the cutting depth of this hole…