Ụlọ ọrụ anyị na-etinyekarị aka na mmepụta na nhazi ngwa ngwa. Ngwaahịa ya bụ isi bụ arịlịka, gụnyere arịlịka aka aka, arịlịka agbakwunyere, arịlịka wedge, wdg; yana bolts, akụ na ngwaahịa ndị ọzọ. Ụlọ ọrụ ahụ nwere akara nke ya, a na-erekwa ngwaahịa ya n'ọtụtụ mpaghara na China. Azụmahịa mbupụ na-ekpuchi Europe: Russia, Belarus, Germany, Italy na mba ndị ọzọ; Ndịda ọwụwa anyanwụ Eshia: Malaysia, Indonesia, Singapore, wdg; Middle East: Dubai. Ọ nwere asambodo mba ụwa dị elu, ISO, CE
Ọ bụrụ na ịchọrọ isonye, biko nweere onwe gị izitere m ozi anyị ga-enyere gị aka n'ịhazi akwụkwọ ịkpọ òkù ngosi.