why does the description state the standard spacing of 2.54mm/0.1" while the illustrations specify the non-standard 2.5mm/0.09"?

The ones I got were 0.1-in (2,.54mm)

Are the square or round female connector?

All connector shells are rectangular. Within each rectangular connector shell, the individual female connectors themselves are designed [shaped] to receive mating square header pins. The solder-tail ends of the female connectors are flat.

What size wire can be used with these ? will they work with 20 gage?

The solder tabs on these headers are intended to be soldered to a PCB -- for PCB to PCB connections. I suppose you could try to solder individual wires to individual tabs [then heat-shrink the joints], but you'd probably risk melting the plastic housings. Plus, your 20ga wire suggests current requirements that might exceed the ratings for these pins. If I were you, I'd look elsewhere for alternatives.

Does this include any 1x4 female headers? the description says it does under "number of pins" but under "package details" it does not list it.

Yes, a couple of them, what you see in the first picture is the different connectors that come in the package

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⚡ Elevate Your Prototyping Game with Every Pin!

UNIVERSAL 2 54 MM PITCH - Industry-standard spacing ensures seamless compatibility with Arduino and breadboards.
ORGANIZED READY TO GO - Transparent storage box keeps your pins sorted and accessible, eliminating downtime.
ALL IN ONE PIN POWERHOUSE - 112 precision pins covering every prototyping need in one sleek kit.
STACK CONNECT LIKE A PRO - Stackable headers clear USB-B connectors and enable multi-shield setups effortlessly.
DURABLE BUILD FOR DEMANDING PROJECTS - Hard metal pins with insulated plastic housing for reliable, long-lasting connections.

The GLARKS 112-piece pin connector kit offers a comprehensive assortment of 2.54mm male and female headers, including stackable and breakaway options. Designed for Arduino and breadboard prototyping, it features durable metal pins with insulated plastic housing, all neatly organized in a transparent box for quick access and efficient project workflow.

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Manufacturer	Glarks
Part number	GLAPZKIT-112
Item Weight	160 g
Package Dimensions	17.1 x 9.8 x 2.4 cm; 160 g
Item model number	8541770554
Material	Plastic
Item Package Quantity	1
Specification met	CE
Batteries included?	No
Batteries Required?	No

GLARKS112Pcs 2.54mm Male and Female Pin Connector Assortment Kit, 100pcs Stackable Shield and 12pcs Breakaway PCB Board Pin Header for Arduino Prototype Shield

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