These stacking headers from Adafruit let you use your Raspberry Pi Pico on a breadboard while still being able to stack add-on boards like PiCowbells on top. The extra-long pins pass through the Pico's mounting holes for vertical expansion. Perfect for prototyping setups where you need both breadboard access and stackable expansion. Key Features Stackable Design – Use on a breadboard while adding modules on top 2× 20-Pin Headers – Complete set for all Pico GPIO pins Standard 2.54mm Pitch – Compatible with breadboards and Pico add-ons Extra-Long Pins – Sufficient length for stacking multiple boards Package Contents 2× 20-pin stacking headers Note: Raspberry Pi Pico not included. Soldering required. Ideal For Breadboard prototyping with Pico Stacking PiCowbell and other Pico add-ons Modular project builds