This is a really easy use prototyping plate. you can put everything from Arduino board to sensors, even a motor on top of it. It fits M2-M3 screws. Specification Size:170x150mm (7×5.9\’\’) Slot size:3mm (0.1\’\’) Total weigt:350g (including all screws) Shipping List Prototyping Plate 1 M3 screw set 50 M3 * 10 Hexagonal Copper standoffs 10 M3 * 10 Hexagonal Nylon standoffs 10 M3 * 20 Hexagonal Nylon standoffs 10 M3 * 30 Hexagonal Copper standoffs 10 M3 * 50 Hexagonal Copper standoffs 10