Ukuze sinqume ubukhulu bodonga lwamashubhu angu-3/16, sidinga ukwazi ububanzi bangaphandle (OD) nobubanzi bangaphakathi (ID) beshubhu. Uma ububanzi bangaphandle bungu-3/16″ futhi lungekho ulwazi oluthile olunikeziwe mayelana nobubanzi bangaphakathi, asikwazi ukubala ngokunembile ukujiya kodonga. Ubukhulu bezindonga bungahluka kuye ngohlobo oluthile lwamashubhu namazinga wokukhiqiza.