Kunezinhlobo eziningi zezikulufu ezihlanganisiwe, ezihlanganisa izikulufu ezimbili ezihlanganisiwe nezikulufu ezintathu ezihlanganisiwe (iwashi eyisicaba kanye newasha yasentwasahlobo noma iwasha eyisicaba ehlukile newasha yasentwasahlobo) ngokuya ngohlobo lwezesekeli ezihlanganisiwe; Ngokusho kohlobo lwekhanda, lingaphinda lihlukaniswe libe yizikulufu zenhlanganisela yekhanda le-pan, izikulufa zenhlanganisela yekhanda eliphikisayo, izikulufu ezihlangene ze-hexagonal zangaphandle, njll; Ngokusho kokuqukethwe, ihlukaniswe nge-carbon steel, insimbi engagqwali ne-alloy steel (iBanga 12.9).