Insimbi eyisikwele uhlobo lwento enezimo ezahlukahlukene, osayizi nezakhiwo ezenziwe nge-ingot, i-billet noma insimbi ngokucutshungulwa kwengcindezi. It ingahlukaniswa kweqa ashisayo futhi kweqa abandayo; Ubude ohlangothini lwensimbi eyisikwele eshubile eshisiwe ngu-5-250mm, kanti leyo yensimbi eyisikwele ebandayo ebunjiwe ingu-3-100mm.