1. Txiav cov khoom nyob rau hauv ib tug nruam curl
2. Tsis muaj nti thaiv, xov qhov
3. High flexural puas lub zog
4. Ntse nti kev ua tau zoo, Kev kub ceev machining
Sprial taw tes kais, tseem hu ua tip kais, yog tsim rau los ntawm qhov thiab sib sib zog nqus threads.Lawv muaj lub zog siab, kev pab lub neej ntev, kev txiav ceev ceev, qhov loj me thiab cov qauv ntawm cov hniav tsom, Nws yog qhov txawv ntawm cov raj nplaim ncaj ncaj haum rau kev siv lub qhov taub.