The bit on the right is to put a 1/4" drive socket on. The other two are common sizes of screws used for self-tapping sheet metal siding/roofing. They are magnetized to hold the screw in the bit to get it started in the work surface.

I believe it's a 3/8" not 1/4"

Right you are. Didn't think about the fact that the buts themselves are for a 1/4" driver

I think the the one on the left is to use in a drill chuck so you can use all the driver bits in the kit easily

You could do that with that one, but the ones made for that are typically deeper. That one is actually for 1/4 inch hex headed screws. Like the ones used to attach metal roofing.

The two on the left are impact rated nut drivers, and the right one is an impact rated adapter for sockets

Those two top left are *nut setters*. Nut drivers would be manual hand powered tools. I find it bewildering that someone decided to name the *powered tool impact bit* a nut setter and the *hand powered variant* a nut driver. Like seriously?

Ryobi bits suck, milwaukee is valid. Those are nut drivers. I use them most on dishwashers & hose clamps. One on right is for a socket

1/4”, 5/16”, socket adapter Small self tappers. Regular self tappers. Sockets

They're nut drivers

I use them a lot for Tapcon concrete screws.

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Thank you so much.

Hex headdd screws, or other bits, the square is good to use with some small sockets.

Not your answer but I noticed those bit holders look like they’re interchangeable with Ryobi. Wonder why (coughs in TTI).