This is a PCB mount, 3 position screw terminal block.
5mm screw terminal block, 2 position, PCB mount
The Micro Maestro is the smallest of Pololu’s second-generation USB servo controllers. The Maestros are available in four sizes and can be purchased fully assembled or as partial kits.
This aluminum heat sink is designed for integrated circuits (IC) of electric components. It's easy to use, and provides the perfect cooling effect for your project.