The best option for size and price. I got this for my bathroom application to drill a hole in the toilet. The saw didn't break or warp like other ceramic drill bits I've bought before, but that may be because I kept spraying water on the drill site to avoid overheating and to preserve the diamond coating. The price I found on other sites is $19. FYI, it took me two hours and a 15Ah battery on my M18 drill.