1. Size: 2.0 x 2.8 inches (50 x 70 mm); Thickness: 0.05 inch (1.2 mm); Hole Pitch: 0.1 inch (2.54 mm); 3. High quality: Made of high-quality and durable bakelite material that makes prototype circuit boards extremely strong and sturdy. Flat surface and all holes in the center. 4. 【Easy to Use】Four mounting holes on the corners of the board make it very convenient to solder components and attach together. 5. Wide Range of Applications: Various prototypes such as college students, engineers, engineers, factories, DIY experiments, electronic projects, breadboards, PC motherboards, PCB projects, etc.