The nkwakọ ụlọ ọrụ na-achọ a dịgasị iche iche nke ọnwụ agụba, gụnyere otu-bevel okirikiri agụba, slitter agụba, shiee agụba, egwe ọka agụba, wdg Onye ọ bụla mbukota cutter agụba undergoes elu okpomọkụ ọgwụgwọ na bụ kpomkwem ala iji nweta ahụkebe eyi na corrosion iguzogide.
Akụkụ ọ bụla nke agụba anyị na-ere na-emesi anyị obi ike na ị ga-enwe mmasị na arụmọrụ ngwaahịa anyị. Ngwa ọgbara ọhụrụ na-ehulata, ịkpụ na egweri ihe na-emepụta agụba kwụ ọtọ na okirikiri nwere scalloped, serrated, perfed, beveled and teethed n'ọnụ ka dabara ngwa gị.