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Title: It's not what I'd expected!
Review: I purchased this cutting bits for my bathroom remodeling because the project required curved lines and irregular shapes to be cut. I attached this particular bits to a 'Dramel variable speed' and used them to cut several half-inch backerboards. Each of the bit seemed to perform as expected within the first 15 feet of cutting. After that the bits became dull and did not cut as fast. I also had to watch the equipment because it could get real warm. I also made an attempt to cut 3/8 inch ceramic wall tile and 3/8 inch marble tile. They don't perform well at all. I ended up buying a rod saw (it was a hand saw) with Tungsten carbide grit edge blade to do the job (slow..real slow, but they did cut nicely after I had some practice). One other thing, I burned one of the bit when I tried to cut a hole and had to drill through one of the beckerboard.
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