Sizinikela ngokungagungqiyo ekuphandeni nasekuphuhliseni ubuchule bokuqamba kwebhola yentsimbi kwaye ikakhulu sivelise iibhola zentsimbi ezinje ngebhola yentsimbi ye-chrome (aisi52100), iibhola zentsimbi zecarbon (aisi1015) iibhola zentsimbi ezingenanto (aisi304.316.420.440c).