Ama-jacks amasondo okuqondisa angamathuluzi abalulekile embonini yezimoto, ikakhulukazi emkhakheni wokugcinwa kwezimoto namathuluzi. Lawa ma-jack aklanyelwe ukuhlinzeka ukwesekwa nokuzinza lapho kuphakamisa izimoto, ukuqinisekisa indawo yokusebenza ephephile futhi ephephile yemishini nakuchwepheshe. Omunye wemisebenzi esemqoka yamasondo okuqondisa ukusiza ekuqondiseni amasondo emotweni lapho iphakanyiswa.