Are the pin holes internally connected like a breadboard?

I'm not exactly sure to what you're referring, but will do my best to answer. The pin holes are connected from the top side to the bottom side of the board. The header pin holes are electrically connected to the adjacent holes. They also have traces between the Power and Ground pins to the associated power & ground headers located on the shield as well as the ICSP pin hole & reset button pin holes.

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Gikfun Prototype PCB Breadboard for Arduino UNO R3 Shield Board DIY (Pack of 5pcs) GK1011

Product ID: 146884282

Details

Brand
Gikfun
Material
gold
Manufacturer
Esooho

⚡Full Arduino I/O pin access

🔧5-pack DIY prototyping power

🛡️Gold-plated anti-oxidation durability

Description

⚡ Power Your Arduino Projects with Prototyping Precision!

PLUG PLAY TESTING - Supports solderless breadboards for rapid circuit experimentation without commitment.
ULTIMATE DIY FLEXIBILITY - Design and solder custom circuits seamlessly with a dedicated prototyping area.
ROBUST GOLD PLATED FINISH - Ensures long-lasting connections and effortless soldering with oxidation resistance.
VALUE PACK FOR INNOVATORS - Get 5 high-quality shields to accelerate multiple projects or collaborative builds.
FULL ARDUINO COMPATIBILITY - Extra connections for all Arduino UNO R3, Mega 1280/2560, and 328P pins included.

The Gikfun GK1011 Prototype PCB Breadboard is a 5-pack of gold-plated Arduino UNO R3 shields designed for seamless custom circuit creation. Compatible with Arduino UNO R3, Mega 1280/2560, and 328P, it offers through-plated holes for durability and extra I/O pin connections, enabling both soldered and solderless prototyping. Ideal for professionals and makers seeking reliable, versatile, and efficient project development.

Specifications

ASIN	B07RGPZ2RW
Best Sellers Rank	#730,128 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1,682 in Prototyping Boards & Accessories
Date First Available	May 7, 2019
Item Weight	2.39 ounces
Item model number	GK1011
Manufacturer	Esooho
Package Dimensions	4.09 x 3 x 0.24 inches

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