The Perfect Choice for Welding: Printed circuit boards can be well matched with electronic components, which can perform the soldering function perfectly. With it, it is no longer necessary to cut large perforated plates, which is very convenient and practical. Excellent Material: The circuit board is made of Bakelite and cardboard, it has a thickness of 1.2mm, it is very strong and durable, not only does it have excellent electrical conductivity and heat resistance, but there is also high safety, very long lifespan. Easy to Install: Our universal prototyping boards are well made and easy to install. There are four precise mounting holes corresponding to the four corners of each circuit board, so it is very easy to use. Strong Compatibility: The size of the universal circuit boards is 5*7cm, the hole distance is 2.54mm, and the aperture is 1.0mm. It has very high versatility, which can perfectly meet your own need to design DIY electronic projects. Wide Range of Uses: The DIY circuit board is suitable for many types of electronic experiment projects and can be widely used in schools, laboratories, students, teachers, researchers, related electronic project technicians and personal electronic enthusiasts etc. Number of parts delivered: 50 Size: 5*7 cm luckymeet