Tensioning Roller Product Type Tensioning Roller Bearing Number 2Z-C3 Bearing Type Ball Idler Bolt Thread Size M8 Idler Hole System of Measurement Metric Length through Bore 35 mm Maximum Belt Width 30 mm Outside Diameter 30 mm Overall Length 51 mm Roller Material Plastic Bearing Closure Double Shielded Bore Diameter 8 mm Compatible with Brand Rosta Compatible with Series 11 Hub Projection 2 mm Lubrication Self-Lubricating Maximum Operating Temperature 100 Degrees C