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A: Yes , Be very careful it has a tendency to jump out of the grout and scratch the tile. I think a variable speed Saw would probably work best on it.
A: Your question is more about the reciprocating saw; I can only say that the Grout Rake fit into my Craftsman reciprocating saw with no problem. But my saw lacked good low-speed control, so I found it hard to use. The main point about the Grout Rake is that it will make a rather wide cut (something like an 1/8 inch or wider); it did not work well on the thin grout I needed to redo on my shower floor. Good Luck
A: They sell sawzall blades that are diamond or carbide.
A: Hello Howie, The blade you selected is made to work with reciprocating saws instead of oscillating tools. Two potential options are listed below with links included. FEIN Carbide Rasp Finger: http://www.homedepot.com/p/FEIN-Carbide-Rasp-Finger-Shaped-1-Pack-63731002017/202914192 FEIN Carbide Rasp Triangle: http://www.homedepot.com/p/FEIN-Carbide-Rasp-Triangular-1-Pack-63731001014/202914194 I hope this helps. Cheers, Chris