The grating is a weldment of steel stripes:
a) the supporting bar 40/5, 50/5, 60/5 and a cross bar
15/4, bordered by a stripe 40/5, 50/5, 60/5, with holes 30x30,
b) the supporting bar 30/10, 40/10,... 100/10 with holes 45x30,
load withstanding also in heavy lorry transportation. The gratings
are used for covering of drainage and drainage of carparks, airports, petrol stations,
garages, workshops etc. - in places with high load.
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