Rab chais hlaukuj tseem hu ua concertina coils lossis razor type barbed wire.Nws yog ib hom tshiab ntawm cov laj kab zov.Nrog cov hniav zoo nkauj thiab ntse thiab cov hlau tseem ceeb muaj zog, cov hlau txiav muaj cov yam ntxwv ntawm cov teebmeem zoo tiv thaiv, zoo nkauj, yooj yim teeb tsa, pheej yig thiab siv tau thiab lwm yam khoom.

   Rab chais hlauyog siv dav hauv tsev nyob, cov chav haujlwm, tsev loj cuj, laj kab ciam teb, cov tub rog thiab lwm qhov chaw uas xav tau kev laj kab thiab kev ruaj ntseg hnyav. Cov hlau txiav tuaj yeem muab faib ua cov kauj concertina, cov hlau txiav ncaj, hom hla thiab hom tiaj tus raws li cov qauv teeb tsa.