Technical sheets | Open grating lids Grating Open. Lower frame in corner 50x50x5. The dimensions of the covers are fully configurable by the customer. Hinges to make the lid swivel. Padlock. Inverted frames to make the lid watertight. Value of Concentrated Load in Kg for a maximum flexion of L125, where L is the distance between supportsOPEN COVERSDistance between supports (mm)4506009001200Open Grating ISO2545331818092Open Grating ISO30552427203136Open Grating ISO381020725430275