I found razor blade-looking sharp metals in my wall What are they?

Some of these slots are simply cut into the wall or medicine cabinet, but others were made decorative through the use of special blade slot tiles Blade bank

so where do all those used razor blades go? in the bottom of the wall! and they wait there until some poor future remodeler decides to

razor shark slot FWIW, you can still buy razor blade wall slot covers 1 Like As in, just a basic mirror hung by some wire on a single nail over an opening in

razor shark slot free Razor blades were inserted into the slot and would drop down inside the wall Newer methods of shaving made the use of these special medicine