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 Glarks 112Pcs 2.54mm Male and Female Pin Header Connector Assortment Kit, 100pcs Stackable Shield Header and 12pcs Breakaway PCB Board Pin Header for Arduino Prototype Shield

Glarks Glarks 112Pcs 2.54mm Male and Female Pin Header Connector Assortment Kit, 100pcs Stackable Shield Header and 12pcs Breakaway PCB Board Pin Header for Arduino Prototype Shield

Product ID: 269305548

Details

Colour
Black
Connector type
Pin
Contact material
Copper
Insulation material
Plastic
Terminal
Pin Terminal

📏2.54mm standard pitch

🔩112 versatile pins total

🧩Stackable & breakaway design

R543

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Description

⚡ Elevate your DIY game with the ultimate pin header kit!

UNIVERSAL 2 54 MM PITCH - Industry-standard spacing ensures seamless compatibility with Arduino and breadboards.
ORGANIZED READY TO USE - Comes in a transparent storage box for quick access and tidy workspace vibes.
ALL IN ONE PIN POWERHOUSE - 112 precision pins covering every prototyping need, from 3 to 40 pins.
STACK CONNECT LIKE A PRO - Stackable headers perfectly clear USB-B connectors and enable multi-shield setups.
DURABLE BUILD FOR LONG TERM PROJECTS - Copper contacts with insulated plastic housing for reliable, corrosion-resistant connections.

The Glarks 112-piece pin header assortment offers a comprehensive set of male and female connectors with a 2.54mm pitch, ideal for Arduino prototyping and electronic projects. Featuring stackable and breakaway designs, durable copper pins, and insulated plastic housing, this kit supports a wide range of pin counts and configurations, all neatly organized in a transparent box for easy access and efficient workflow.

Specifications

ASIN	B07CWSXY7P
Best Sellers Rank	#12,895 in Computers ( See Top 100 in Computers ) #321 in Single-Board Computers & Accessories
Brand Name	Glarks
Color	Black
Connector Gender	Male and Female
Connector Type	Pin
Contact Material	Copper
Customer Reviews	4.6 4.6 out of 5 stars (837)
Insulation Material Type	Plastic
Manufacturer	Glarks
Material Type	Plastic
Maximum Voltage	5 Volts (DC)
Model	8541770554
Number of Items	112
Number of Packs	1
Part Number	GLAPZKIT-112
Specification Met	CE
Terminal	Pin Terminal
UPC	603935399623
Unit Count	1.0 Count

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R543

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Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

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