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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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

Product ID: 74970870

Details

Connector Type
Pin
Contact Material
Copper
Insulation Material
Plastic
Material
Plastic
Terminal
Pin Terminal

📏2.54mm standard pitch

🔩112 versatile pins total

🧰All-in-one organized kit

93.52 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Elevate your DIY game with the ultimate pin connector arsenal!

UNIVERSAL 2 54 MM PITCH - Fits perfectly with Arduino and breadboards for seamless prototyping.
COMPACT TRANSPARENT STORAGE - Keep your workspace tidy and components accessible at a glance.
COMPREHENSIVE 112 PIECE KIT - Includes male, female, long & short pins to cover every project need.
STACKABLE SHIELD COMPATIBLE - Designed to clear USB-B connectors and stack multiple shields effortlessly.
DURABLE INSULATED PLASTIC COPPER - Ensures reliable connections and long-lasting performance.

The Glarks 112Pcs Pin Connector Assortment Kit offers a complete set of male and female 2.54mm pitch headers, including stackable and breakaway types, ideal for Arduino prototyping and electronic projects. Crafted from insulated plastic and copper pins, this kit ensures durability and compatibility with various circuit boards, all neatly organized in a transparent box for easy access.

Specifications

ASIN	B07CWSXY7P
Best Sellers Rank	#39,824 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in DIP Switches
Brand Name	Glarks
Connector Gender	Male and Female
Connector Type	Pin
Contact Material	Copper
Customer Reviews	4.6 4.6 out of 5 stars (865)
Insulation Material Type	Plastic
Manufacturer	Glarks
Material Type	Plastic
Maximum Voltage	5 volts_of_direct_current
Model	8541770554
Number of Items	112
Number of Packs	1
Part Number	GLAPZKIT-112
Terminal	Pin Terminal
UPC	603935399623
Unit Count	1 Count

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