... manufactured according to customers' requirementsFor example:1) Bearing bar pitches may be 12.5, 15 to 30, ... 32x5, 40x5, 50x5, 65x5, 75x6, 75x10---100x10mm etcI bar: 25x5x3, 30x5x3, 32x5x3, 40x5x3 etcUS standard: 1''x3/ ... StylePlain / Smooth, Serrated /teeth, I bar, serrated I bar 7StandardChina: YB/T 4001.1-2007, USA: ANSI/NAAMM(MBG531 ... -1-2006, Japan:JIS steel grating for ceiling grate cover (factory)