... , 25x4, 25x5, 30x3, 30x4, 30x5, 32x3, 32x5, 40x5, 50…75x8mm, etc.2Bearing bar pitch25, 30, 30.16, 32.5 ... , 34.3, 40, 50, 60, 62, 65mm, etc.3Cross bar5x5, 6x6, 8x8mm ... (twisted bar or round bar)4Cross bar pitch40, 50, 60, 65, 76, 100, 101.6, 120, 130mm ... modern trend.The best drainage: Leakage area of 83.3 percent, more than twice of cast iron products. Hot ...