1.dustproof, waterproof, heavy load, turn flexiblily,low noise 2.ISO 9001 proudct 3.both small or large quantity can be meeted Zinc plated rollersRoller diameter can be 25mm, 38mm, 50mm, 60mm, 76mm, 89mm,Free steel roller,Tapered steel roller,Grooved steel roller,Sprocket steel roller,Drive taper steel roller,Accumulating steel roller etc. Roller DiaShaftDiaTube ThicknessRoller LengthTube ...