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They are Phillips round head, #10 x 1/2", self tapping. I would strongly recommend you get them from CMI Marine, which has the later ones with the plastic lock bushing on them. Pan head non-self tapping can also be used if the threads are still good in the SS rail. Locktite can also be added to the assembly, particualrly if threads are somewhat stripped in the rails.

Another alternative for the Tee's is to buy the new style in SS, by Sea Dog, Whitecap, Specialty Marine or West Marine, which have compression Allen screws instead of threaded screws. They actually hold better, and will never fail.