• Ubuso bwiza, buramba nkibishya: Ubuso busizwe neza nibice byinshi, bidacika kandi bizamura urwego rwibikoresho.
• Byatoranijwe neza, biramba: Zinc alloy material ifite ubukana bukomeye hamwe no kurwanya ruswa, ntabwo byoroshye guhinduka kandi byangiritse;
• Gufata neza, kubumba igice kimwe: Byakozwe mubice bimwe, byunvikana, ukuboko kumwe gufashe, kumva neza;
• Umwobo usanzwe, washyizweho cyane: Bikwiranye na 99% ya screw, urudodo rurasobanutse, kurumwa birakomeye, kandi ntabwo byoroshye kurekura igihe kirekire.