Metallics JSS1414 Screw 1/4-20 x 1/4 SKT S-Scr Cup St- (Jar 100)

That is the application it is built for. The JSS1414 is a steel socket set screw with a cup point in a 1/4-20 thread, carried as an electrical fastener, which is the size and tip style used to clamp conductors in mechanical lugs, split bolts, and set-collar connectors. The only thing to confirm is that the hole in your connector is tapped 1/4-20 and that 1/4 inch of screw length is enough to reach the conductor, since a deeper body may have taken a longer screw originally.

Cup point, yes. The hollow, slightly ground ring at the tip bites into the mating surface and leaves a small indentation, which is what gives it its grip on a shaft, collar, or busbar lug. That bite is permanent, so if you need a mark-free seat on a finished surface, a flat or nylon-tipped screw is the better choice; for electrical lug and set-collar work where holding force matters more than cosmetics, cup point is the standard tip.

It is a socket (hex key) drive screw, headless, so it drives with an Allen wrench or hex bit rather than a screwdriver. A 1/4-20 socket set screw takes a 1/8 inch hex key. Since the screw is headless it seats fully inside the tapped hole, which is what lets it sit flush in a lug or collar.

One hundred screws per jar. The jar pack is the usable format for a service van or a shop bin, where set screws get pulled a handful at a time for lug and collar replacements rather than consumed on a single job.

Steel. For set screws that matters because the tip has to be harder than the part it bites into to hold a conductor or shaft without deforming. Steel set screws are not corrosion resistant on their own, so for outdoor or damp-location terminations a stainless screw is the better pick.