I am not sure. Whatever the package says is what is in there.
Yes; I would never buy 1/8" pegs for my 1/4" peg board application.
These are spacers that go between the board and wall using the included screws. They give enough clearance between the two to allow the pegs to penetrate the pegboard.
I have yard equipment hanging on the 4" hooks. I use the smaller ones for tools. I have no issues with weight. make sure the peg board is secure though.
These are used to mount the pegboard to the wall. The spacers go between the board and wall so there will be enough space for the pegs to penetrate the pegboard .
You don't...the holder sticks out too far to use the brace.