Yakaremara simbi mbabvu ndeyepamusoro ribbed simbi mabara, anozivikanwawo sembabvu simbi mbabvu, kazhinji ine mbiri mbabvu refu uye mbabvu dzakachinjika dzakagovaniswa nenzira yekureba.Chimiro chembabvu yakachinjika ndeye spiral, herringbone uye crescent, Screw thread simbi isimbi inodiwa pakuvaka zvinhu zviri pamusoro pesaizi yepakati, uye China ine imwe vhoriyamu yekutumira kunze gore rega.