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Title: Don't even think of cutting 1/2" backer board with this.
Review: I am in the process of laying about 250 sf of tile and purchased these bits to allow me to make cuts in 1/2" backerboard (cement board). After one painfiully slow cut, the bit broke. I contacted Rotozip and they recommended using the RZ250 (1/4" shank bit). It's working out very well! RotoZip says that this bit should also work, but I think not. If you are cutting thicker cement board, pay the extra [money] and get the RZ250 bit.
