Therefore, experience and my intuition told me to try this option based on the mostly positive reviews. I decided at $17 instead of $45+ at the retail/hardware store it was worth it, especially since I only had to make one hole. My mission was to drill a 2-1/2" diameter hole in 3/8" thick ceramic tile for a shower switch. No offense, but I've learned that some people base their ratings on their own inexperience, lack of skill, or inability to follow directions. This does not translate into anβ¦