Kazhinji, ndiyo siruu yehuni ine musoro wemunwe, mazino akakora uye kuomarara kuumbwa, pamwe nealuminium alloy nepurasitiki.Rudzi rwakakosha rwekuzvirovera screw inoshandiswa kuvhura shinda mumakomba esimbi inonzi tap.
Self tapping screws kune isiri-simbi kana simbi yakapfava, haidi kurova pasi gomba uye kurova;Self tapping screws inonongedza, kuitira kuti "self tapping";Ordinary screws are flat - headed and of the same thickness.
Self tapping screw ndiko kuti: dhirai maburi pasina makomba, screw uye musiyano mukuru, musoro wakanongedza, chinhambwe chezino chakakura, uye iyo chip yemahara waya yekubaya yakaita senge, haigone kubaya zvakananga screw mukati, simbi nepurasitiki zvinowanzoshandisa nzira iyi.
Inogona kubatanidzwa pane izvo zvinhu, zvichivimba neshinda yayo pachayo, ichabatanidzwa muviri "tepi - dhiraivha, kusvina, kudzvanywa" kunze kwetambo inoenderana, kuitira kuti ive pedyo nemumwe.