IZICI
Idizayinelwe ngokukhethekile umthwalo we-torque ephezulu, uthuli oluphezulu, umswakama kanye nezinga lokushisa elizungezile, elinesakhiwo esiqinile.Ifanele ukusetshenziswa kwe-metallurgy, imboni yamakhemikhali, ukongiwa kwamanzi, ichweba, imboni yokukhanya, ukwenza amaphepha nokunye.