This is a solid, one-piece, stainless steel shelf that installs without much difficulty into an existing, pre-tiled wall with 1/8" grout lines. It took less than 45m to start and finish by following the instructions attached. I used a Dewalt diamond coated rasp blade on an oscillating saw which made the job a lot easier. You could probably do this with a Dremel tool if that's all you had. I don't think normal hand tools can do that, of course it would be easier to install before grouting.
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