4 Sets GPIO Breakout DIY Breadboard Shield Red Expansion Board Kit Compatible with Raspberry Pi 4 3 2 B+ A+ Features: The breadboard can provide a good prototype development platform for Raspberry Pi, and you can build your own circuit on this breadboard and have enough room for more complex circuit designs Combining the functions of Raspberry Pi GPIO pins to achieve many different functions, you can build an electronic experiment environment Easy to assemble, prototype breadboard, compatible with GPIO, with write-protected ID EEPROM With high-quality material, gold plated finish prevents oxidation,all pads from the top to the bottom are plated with holes We strive to make our 100% meet your requirements, and do our best to satisfy you Specifications: size: 55mm x 65mm, thickness: 1.5mm Package included: 4 x RPi Prototype Hat Breadboard 4 x Pin Header 16 x Hollow Copper Pillar 16x Screws M2.5x16mm 16 x M2.5 Nuts