These hasiibikoresho bya spur zikoreshwa kuri silindrike igabanya ibikoresho,ni ibikoresho byo hanze. Byari hasi, byukuri neza ISO6-7 .Ibikoresho: 20MnCr5 hamwe nubushyuhe bwo kuvura carburizing, ubukana ni 58-62HRC .Ibikorwa byubutaka bituma urusaku ruba ruto kandi byongera ubuzima bwibikoresho.