• Fine nto, kav ntev li tshiab: Qhov saum npoo yog polished los ntawm ntau txheej, uas tsis ploj mus thiab txhim kho qib ntawm cov rooj tog.
• Ua tib zoo xaiv, siv tau ntev: Zinc alloy cov khoom uas muaj zog hardness thiab corrosion kuj, tsis yooj yim deformed thiab xeb;
• Yooj yim tuav, ib daim molding: Ua nyob rau hauv ib daim, nws xav tias tuab, ib txhais tes tuav, xis nyob;
• Standard ntsia hlau qhov, nruj nreem koom: Haum rau 99% ntawm cov ntsia hlau, cov xov yog ntshiab, tom yog nruj, thiab nws tsis yooj yim heev loosen rau lub sij hawm ntev.