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HENGZHOU's extensive range ofdrain covers(webdrain) quality grates and frames have been developed in order to offer a totally complete drainage sysem. All grates are hot dipped galvanized for superior finish and extended life.The entire range has been designed with a view to maximising the grate open area thus achieving a hydraulically effcient grate. Description: 1) Bearing bar specification: 20 x 3 to 100 x 6 2).Bearing bar pitches maybe 12.5,15,25,30,34,40,50,60,80mm,of which 30 and 40mm are recommended. 3).Corss bar pitch maybe 38-200mm,of which 50 and 100mm are recommond. 4).Type of bearing bar can be plain, serratted and I bars. 5).Material can be Q235(mild steel), stainless steel. 6).Treatment of surface: untreated or galvanized. 7).US standard is also in our production area.