Eriri eri zuru ezu bụ ihe a na-ahụkarị, ihe nkedo dị ngwa ngwa nke a na-eji n'ọtụtụ ngwa ihe owuwu.A na-eji eriri na-aga n'ihu site n'otu akụkụ ruo na nke ọzọ ma na-akpọkarị ya dị ka mkpanaka zuru oke, redi rod, TFL rod (Thread Full Length), ATR (All thread rod) na ọtụtụ aha ndị ọzọ na acronyms.