Need Help With I.D. A Few Mystery Tools

[DadsTools]

Going through a big box of old tools that seem to date from the 1920s to 1960s. Found a few odd items that could use some help identifying. Rather than starting a separate thread for each, I figured I'd make three posts on the same thread.

Item #1:

A set of cylindrical tools that look like they're designed to either press something or to gauge the size of a hole. They have knurled shanks so it appears that they might be hand-held. I'm not too much up on machinist tools, and that's what these look like. They're about 3" tall, and range from about 1/2" up to 1" in diameter. Whatzit?

 

[DadsTools]

Item #2:

A set of feeler gauges I've never seen before. Perhaps this should be more in the vintage section, but I'll try it here first. The item is stamped GB 210. The four thinner gauges in the center of the array look to be all the same thickness (???), as if you combined them to get specific sizes. The bottom gauge is about the same thickness as three of the thin ones, and the top stamped gauge is about the same thickness as all the others combined. Whatzitfer?

 

[DadsTools]

Item #3

Don't know if this is a tool or a part. Aluminum body with some sort of beveled anvil that screws into the top. Length of body is about 4 inches. Inside is a round channel that's hollow up to the threaded tip so that the anvil screw protrudes into the channel. Also has unthreaded through-holes on every side that also lead into the center channel. Whatzit?