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 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-piece comprehensive kit

🧩Stackable & breakaway headers

¥3484

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Description

⚡ Elevate your DIY game with the ultimate pin header kit — never run out of options again!

DURABLE BUILD QUALITY - Copper contacts with insulated plastic housing for reliable, long-lasting connections
ORGANIZED ACCESSIBLE - Transparent storage box keeps your headers sorted and ready for your next innovation sprint
STACKABLE SHIELD READY - Perfect height headers designed to clear USB-B connectors and stack multiple shields effortlessly
PRECISION 2 54 MM SPACING - Industry-standard pitch ensures seamless Arduino & PCB compatibility
ALL IN ONE PIN HEADER ARSENAL - 112 versatile male & female pins for every prototyping need

The Glarks 112-piece Pin Header Connector Assortment Kit offers a complete set of male and female headers with 2.54mm spacing, including stackable and breakaway types. Crafted with copper contacts and insulated plastic, these headers are optimized for Arduino prototyping, PCB projects, and electronics DIY. Packaged in a transparent organizer, this kit ensures quick access and versatility for professional-grade circuit building.

Specifications

ASIN	B07CWSXY7P
Best Sellers Rank	#9,302 in Computers ( See Top 100 in Computers ) #210 in Single-Board Computers & Accessories
Brand Name	Glarks
Color	Black
Colour	Black
Connector Gender	Male and Female
Connector Type	Pin
Connector type	Pin
Contact Material	Copper
Contact material	Copper
Customer Reviews	4.6 out of 5 stars 831 Reviews
Insulation Material Type	Plastic
Insulation material	Plastic
Manufacturer	Glarks
Material	Plastic
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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¥3484

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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