Do they have these same headers but in double row?

Yes, but they are 17mm https://www.amazon.com/dp/B07842GC5F

what is the diameter of the pins?

The pins fit in solderless breadboards so they are 22 AWG for all practical purposes.

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40 Pin Breakaway Headers 0.1" Male Equal Length 2.54mm, Pack of 10

40 Pin Breakaway Headers 0.1" Male Equal Length 2.54mm, Pack of 10

Product ID: 19224547

Details

Centerline Length
15 millimeters
Color
Black
Connector Type
IDC
Item Pitch
2.5
Material
Metal
Mounting Type
PCB Mount

📏0.1" (2.54mm) pitch precision

🔧Breakaway design for custom lengths

🧩Fits solderless breadboards snugly

€ 14.77

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡️ Break boundaries, not your flow – headers that adapt to your innovation!

DUAL SIDED LONG PINS - 6.25mm pins on both sides guarantee secure connections and reliable signal integrity.
UNIVERSAL COMPATIBILITY - Standard 2.54mm pitch and PCB mount design make these headers a must-have for every electronics toolkit.
CUSTOMIZABLE LENGTHS ON DEMAND - Easily break or cut headers to fit any project size, giving you ultimate flexibility.
PACK OF 10 FOR BULK EFFICIENCY - Get multiple headers in one pack to power through your prototyping without interruptions.
PRECISION PITCH FOR SEAMLESS PROTOTYPING - 0.1" spacing ensures perfect alignment with standard breadboards and connectors.

This pack of 10 male 40-pin breakaway headers features a precise 0.1" (2.54mm) pitch with equal-length 6.25mm pins on both sides, designed to fit snugly into solderless breadboards. Their breakaway design allows for easy customization to any length, making them ideal for flexible, professional-grade prototyping and circuit board projects.

Specifications

ASIN	B015KA0RRU
Centerline Length	15 millimeters
Color	Black
Connector Type	IDC
Customer Reviews	4.7 4.7 out of 5 stars (120)
Item Dimensions W x H	0.25"W x 0.25"H
Manufacturer	Generic
Material Type	Metal
Model	706693367467
Mounting Type	PCB Mount
Number Of Contacts	40
Number Of Poles	40
Number of Items	10
Number of Positions	40
Pitch	2.5 millimeters
UPC	706693367467

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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€ 14.77

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered 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 Greece.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

View all Trustpilot reviews