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Chanzon high quality universal print DS perf boards widely used among electronic experiments and point-to-point DIY IoT projects. Pre-tined plating thru holes desgin for easy installation of DIP, sensors, transistor and other component. Glass fiber material FR-4 flame resistant safe for sodering/welding.Each pcbs with 4 larger solderable holes(diameter approx 2.25mm) on the corners allowing easy attachment of medium sized wire.34 pieces for general use.Product Specification: - Holes: Pre-tinned- Dimension: 4x6/ 3x7/ 5x7/ 2x8/ 7x9 CM- Quantity: 34 pieces in total of 5 different sizes- Thickness: about 1.6mm- Hole-pitch: 2.54 mm / 0.1 inches- Hole-diameter: 1 mm / 0.039 inches- Material: glass fiber FR-4- Color: GreenPackage: - 8pcs 4 X 6CM double-sided PCB board with 280 holes- 8pcs 3 X 7CM double-sided PCB board with 240 holes- 8pcs 5 X 7CM double-sided PCB board with 432 holes- 8pcs 2 X 8CM double-sided PCB board with 168 holes- 2pcs 7 X 9CM double-sided PCB board with 806 holes