I-diameter ephezulu ye-screw countersunk inkulu, kwaye ingaba yingqukuva okanye i-hexagonal, ukwenzela ukuba izixhobo ezifana ne-screwdriver okanye i-wrench zinokujika i-screw.Umphezulu ophumayo uphinde uthintele i-screw ekubhobhozeni ngokunzulu kwizinto eziphathekayo kunye nokwandisa uxinzelelo lwe-screw kwizinto eziphathekayo.Izikrufu ze-Countersunk zinokususwa okanye ziphinde zifakwe ngokuthanda ngaphandle kokuphazamisa ukusebenza kwazo kakuhle, kwaye zinokunika amandla amakhulu kunezikhonkwane, kwaye zingaphinda zisetyenziswe.Intloko ye-screw countersunk inokutshatyalaliswa ngokupheleleyo kwizinto eziphathekayo zemveliso, kwaye intloko ye-screw ayiyi kudlala indima yokuthintela.
Iqhele ukusetyenziswa kwizixhobo zombane, oomatshini bombane, izixhobo zoomatshini, izixhobo zasekhaya, iimveliso zedijithali, iiprojekthi zogcino lwamanzi, umhombiso kunye nolwakhiwo, njl.