... 2.Our Factory started since 1986 3.stair treads,Ditch cover , tank grating ,pavement grating ,Steel Flooring Steel ... grating and in customized shapes perclient's requirements.1) Bearing Bar (Load Bar) Specifications (mm): The specification of ... plain type and serrated type bearing bar is 20 x 3 to 100 x 10; ... x 4,75 x 7 x 4, etc.2) Bearing Bar Pitch (center to center): 12.5, 15, ...