This is a very basic double sided prototyping board with standard 0.1" spacing through holes and four 3mm diameter mounting holes. There are 22x26 holes in total. Great for quickly prototyping stackable circuits. Specification * Size:58mm x 78mm(2.28"x3.07") Shipping List * ProtoBoard - Rectangle 2" Double Sided x1 https://elecena.pl/product/22714474/protoboard-rectangle-2-double-sided-discontinued 2023-03-06 https://elecena.pl/product/22714474/protoboard-rectangle-2-double-sided-discontinued 2024-09-19