Insimbi eyisicaba isho insimbi engu-12-300mm ububanzi, 3-60mm ubukhulu, ingxenye engunxande kanye nonqenqema olubuthuntu.Insimbi eyisicaba ingaqedwa njengensimbi, kodwa futhi ingasetshenziselwa ukushisela ipayipi lingenalutho kanye ne-slab elincanyana leshidi eligoqayo.Ukusetshenziswa okuyinhloko: Insimbi eyisicaba njengempahla ingasetshenziselwa i-hoop iron, amathuluzi nezingxenye zemishini, isakhiwo esisetshenziswa njengezingxenye zesakhiwo sohlaka, izitezi ezizihambelayo.