Ibikoresho
Ubwoko bwibyuma bikoreshwa mubikorwa ningingo yingenzi mugihe kirekire cyibicuruzwa byanyuma.Ibyuma byo mu rwego rwo hejuru birinda kwambara ibyuma birwanya kwambara kandi biramba bizatoranywa, harimo 40Cr, 20CrMn, ibyuma bitagira umwanda, nibindi.