Metals ea Perforated ke lishiti tsa tšepe, aluminium, tšepe e sa hloekang kapa lialloys tse khethehileng tse phunyeletsoang ka masoba a chitja, a lisekoere kapa a mekhabiso ka mokhoa o ts'oanang. ). Boholo ba lesoba le tloaelehileng bo tloha ho .020 ho isa ho 1″ le ho feta.