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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🔌 Connect smarter, build faster, and never run out of pins!

CUSTOMIZABLE FIT - Easily trim pins to your exact size for a flawless, snug connection every time
PERFECT PITCH PRECISION - Standard 2.54mm spacing ensures seamless compatibility with breadboards and PCBs
ALL IN ONE PIN POWERHOUSE - 112 precision pins covering every Arduino prototyping need
STACK SHIELD LIKE A PRO - Stackable headers designed to clear USB-B connectors and enable multi-shield setups
DURABLE BUILD FOR DEMANDING PROJECTS - Insulated plastic and hard metal pins built to last through countless prototypes

The Glarks 112Pcs Pin Connector Assortment Kit offers a comprehensive selection of male and female 2.54mm headers, including stackable and breakaway types, perfectly suited for Arduino and PCB prototyping. With 112 durable pins in various lengths and configurations, this kit ensures professional-grade connectivity and flexibility for electronics enthusiasts and engineers alike.

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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

Glarks 112Pcs 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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