1000m 10.5mm hlau pom rau cov pob zeb ua kom muaj zog.
Tom qab kev txhim kho, cov hlau nrog peb cov qauv: TWR01, TWR02 thiab TWR03 tam sim no ua tau raws li cov neeg siv khoom xav tau. TWR01 thiab TWR02 yog qhov zoo dua rau cov pob zeb uas muaj cov hlau tsawg dua thiab TWR03 txaus siab los ntawm cov neeg siv khoom los txiav cov kab nrog rebars, ob qho tib si ceev thiab lifespan.
