When you purchase steel gratings, there are mainly include below type for your reference.
Welded steel bar grating
Close-Mesh grating
Serrated bar bar grating
Heavy duty steel grating
Press-Locked grating
Swage-Locked grating
Platform steel grating
Gutter cover bar grating
Stainless steel grating
Galvanized bar grating
Fiberglass grating
Painted bar grating
Stair Tread
Platform Grating 
Stair Tread Steel Gratings 
Trench Cover Grating 
Walkways Grating
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