40 boards in 6 different sizes: 10pcs 2x8cm, 10pcs 3x7cm, 8pcs 4x6cm, 8pcs 5x7cm, 2pcs 6x8cm, 2pcs 7x9cm, which can fit your components, no need to cut a large perforated plate, and plate integration can be achieved also by drilling on the sides. 1.6mm thick FR4 material, high quality durable fiberglass, makes a very strong and sturdy prototype circuit board. Standard hole spacing of 2.54 mm (0.1 inch) - compatible with all screens and breadboard fittings Pre-tinned plated holes on the panel make it very convenient to solder components and sensors for your projects. M2 mounting holes in each corner for convenient and secure fixing.40 Piece PCB Board Prototype Panel Features: 40 pieces in 6 different sizes A good assortment to meet your design requirements such as electronic experiments and DIY projects. Easy to use Pre-tinned holes plated on the panel make it easy to solder components and sensors for your projects. Easy installation 4 The mounting holes at the corners of the board are very convenient to install them together. Specifications: Dimension: 2x8/ 3x7/ 4x6/ 5x7/ 6x8/ 7x9cm Quantity: 40 pieces in total of 6 different sizes Material: high quality FR4 fiberglass Thickness: about 1.6mm Hole-hole: 2.54mm Hole diameter: 1mm Listing Packing: 10pcs 2x8CM Card of 10pcs 3x7CM PCB Prototype Board 8pcs 4x6CM PCB Prototype Board 8pcs 5x7CM PCB Prototype Board 2pcs 6x8CM PCB Prototype Board 2pcs 7x9CM PCB Prototype Board 1 x Free Plastic Box