ʻO 20CrMnTi ka mea i hoʻohana ʻia no kēia mau kaʻa, he kila haʻahaʻa kalapona. ʻIke ʻia kēia mea no kona ikaika maikaʻi loa a me ka lōʻihi, kūpono ia no nā noi kaumaha i nā mīkini mahiʻai.
Ma ke ʻano o ka mālama wela, ua hoʻohana ʻia ka carburization. ʻO kēia kaʻina hana e hoʻokomo i ke kalapona i loko o ka ʻili o nā mea hana, ka hopena i kahi papa paʻakikī. ʻO ka paʻakikī o kēia mau mīkini ma hope o ka mālama ʻana i ka wela ʻo 58-62 HRC, e hōʻoia ana i ko lākou hiki ke kū i nā ukana kiʻekiʻe a me ka hoʻohana lōʻihi..