... 2>Cross bar pitch;50,100mm 3>Plain,Serrated,I-shape 4>Hot-dipped galvanized,Painted,Untrea Product 1.ISO9001:2008 management 2 ... Grating Panels Sizes: 3'x12', 3'x20', 3'x24'.6.Surface Treatment: Bare, Paint and Hot Dipped Galvanized.7.There are three kinds of steel ... dranage pit cover,stair tread,etc.Serrated:Better non-skid property & safety compared with plain grating.I-Shape:lighter,more economical ...