The through hole between the inner layer, after pressing, can not be seen, so do not occupy the outer area, the upper and lower sides of the hole are in the internal layer of the board, in other words, buried in the board.
Umgodi odabula phakathi kwezendlalelo zangaphakathi, ngemuva kokucindezela, awubonakali, ngakho-ke awudingi ukungena endaweni engaphandle, izinhlangothi ezingenhla nezingezansi zomgodi zisengxenyeni engaphakathi yebhodi, ngamanye amagama, zingcwatshwe ibhodi