Isakhiwo sinobukhulu obuhlukahlukene, kanti obujwayelekile yilobu: 21*41/41*41, 41*62, 41*82, njll. Umshini ofanayo ungakhiqiza osayizi abahlukene, ungamukela umklamo olungisekayo ozenzakalelayo noma umklamo wekhasethi noma ulungise ama-roller ngama-shims.
Amaphrofayili esakhiwo asetshenziswa kabanzi, hhayi nje kuphela ekusekelweni kwelanga, kodwa futhi nasekusekelweni okulwa nokuzamazama komhlaba, ngenxa yamandla ayo aphezulu kanye nokufakwa okulula, inconywe kakhulu futhi isetshenziswa embonini yokwakha.