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Bearing Bar: the even rolling flat steel, major material for steel grating,which two ends on the base of girders.	Cross Bar: wringed steel bar with the square section,to fix the bearing bars by welded upon them	Seal bar: steel bar welded together with the ends of bearing bars,to seal the edge of grating.

Length(Span): the most measurement according to the parallel direction of bearing bars,even if it’s shorter than the "width",marked as “ㄣ”in the drawing.	Width: the measurement according to the parallel direction of cross bars,even if it’s longer than the "length"	Punched teeth:Little semicycle nicks punched on the bearing bar to strengthen the anti-alip capacity

Anti-slip Bar:coarse bar fixed on the front edge to lest slip	Washboard:Flat steel welded on the edge of grating,which top is higher than the grating’s fence	Hollow and gap:parts cutted from the grating in order to let tubes or equipments crossing,or avoid obstacle

Net Area: the actual area of grating without any hollow and gaps	Total Area: area calculated according to most dimension of grating,including with all hollow and gaps