ZEGA karkashin kasa guda hannu hakowa jerin hakowa, yadu ake amfani da shi a karkashin kasa ma'adinai hakowa, kananan rami hakowa da kuma anchor bar rami kamar karfafa injiniya da kyau tsara siffar, goyon baya, tsarin sarrafawa da sauran bangarori zai samar da abokan ciniki mafi inganci hakowa kwarewa.

UJ21 aka tsara don kasa da kasa ta hanyar hanyoyin da aka daidaita, da aka tsara high-karshen, mai ƙarfi, da kuma mafi zaɓi daidaitawa brazing inji, fadada anchor bar aiki a kan hakowa aiki.