They were advertised as compatible with razors that use Gillette Track II blades; However, this is not the case. My razor, which I have used for years with Gillette Track II blades, does not fit these knockoffs due to the bulge in the center of the replacement blades where the blades slide. I noted that in the uploaded photos. There are 3 connection points on the back of these blades that hold them together; 2 are flush with the base of the razor and 1 (middle) is raised higher. This will prevent the razor blades from slipping on the base of the razor. Very upset as I now have 100 of these useless blades and they CANNOT be taken back. Don't go cheap - get genuine Gillette Track II blades.
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