Qhov Loj ntawm Cov Ncej Guardrail
Puag ncig Hollow txoj kab uas hla 114mm lossis 140mm;
Thickness 4 hli los yog 4.5 hli;
Ntev 1.2m, 1.4m, 1.85m, 2m, 2.15m lossis 2.27m
