Are the key mark with the size? are only the holder?

Both are marked with the size. The size is printed on the side of the hex keys also.

Do the keys stay in the case, or do they fall out easily?

The keys stay in case perfectly. You have to push it out with slight force.

I'm novice to DIY, are these the tools I need to remove/put up towel racks, etc.?

This is one tool that you might use. Many towel racks use a small Allen bolt (hex head screw) to hold the fixture to a bracket that is attached to the wall. Another possibility is a small flat-head screw. If you are removing an old fixture, look around the edge of the towel holder to see what kind of screw is used. If it has a hex shaped hole this tool should work. New fixtures that use an Allen bolt should come with the correct wrench for that fixture. You probably will need a few other tools (screwdrivers, drill, measuring tape, etc) to install a new fixture.

Are these hex keys made in the USA or somewhere else such as China?

The hex set I bought does not have any origin markings on it, although the original package might have. Given the these are not marketed as "Made in USA," some parts might be made abroad. That said, these wrenches are better quality than many I have purchased in the past. They seem very well made to me.

Colour	Black
Brand	STANLEY
Material	Alloy Steel
Item Weight	1 Pounds
Item Package Quantity	1
Head Style	Hex
Finish Type	Oxide Coated
Operation Mode	Mechanical
Manufacturer	Stanley
UPC	043953594547 756635039020 797267854957 076174857535 013161002318
Global Trade Identification Number	00076174857535
Item model number	85-753
Product Dimensions	26.92 x 29.97 x 4.06 cm; 453.59 g
ASIN	B000NIFJQE

85-753 22 Piece Long Arm SAE & Metric Hex Key Set

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