Qhov ntsuas hluav taws kub ntawm cov qhov rooj hluav taws kub yog muab faib ua peb hom. Lub sij hawm tiv thaiv hluav taws ntawm Class A steel qhov rooj hluav taws yuav tsum tsis pub tsawg tshaj 1.5 teev; Lub sijhawm hluav taws kub ntawm Chav B steel qhov rooj hluav taws yuav tsum tsis pub tsawg tshaj 1.0 teev; Lub sij hawm hluav taws kub ntawm Class C steel qhov rooj yuav tsum tsis pub tsawg tshaj 0.5 teev.

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