anti slip bar grating 1>12 years factory 2>plain grating ,serrated, ... ,30,40,60mm etc. also be according to clients requirement and 30,40,60mm are recommended4. Cross bar picth:38,50 ... ,76,100mm,also be according to clients requirement and 50,100mm are recommended.5. The Maximum length of black ... steel.7. Surface treatment: untreated, painting or hot dip galvanizing. anti slip bar grating