... :platform,ladders,floor drain,floor drain ISO9001 Steel Bar Grating Material:steel grating is made of low ... hot dipped Galvanzied Specification:steel gratingBearing bar specification:20x3 to 100x6Bearing bar pitch:12.5,15,25,30, ... 40,60 mm etcCross bar picth:38,50,76,100 mmChina standard: G203 ... be used as the residence outside the window, the balcony guardrail, highway, railway guardrail etc.