After soldering the pin headers of 2.54mm pitch on the through-holes of PCB, it can be seamlessly plugged into UNO R3 controllers. It also comes with four 3mm fixed holes for tight mounting.

For easy use, other components can be directly soldered on the PCB through-holes to complete various prototype circuits. A tiny breadboard can be stuck on the prototyping area to complete various circuit experiments using jumper wires.

Features:
High quality double-sided PCB
All holes are plated through
Material: high quality FR-4 PCB
Hole pitch 2.54mm
Hole Diameter: 1.0mm
Comes with four 3mm fixed holes
You need to solder the pins yourself