The W, S, and T 60 lenses were indeed made for Canon FL lenses. FL, for those who do not know it, was the precursor to the FD mount Canon SLR lenses. W is 'wide', S is 'standard' and T is 'tele'. 60 refers to the outside lens diameter, since they fit over the top of the lens. Most of these lenses were made to take a 58mm filter, hence a 60mm slip-on lens hood.
Do not buy them. I want them all to myself.
Immanentizing the eschaton since 1987.