Tensioning Roller Product Type Tensioning Roller Bearing Number 2Z-C3 Bearing Type Ball Idler Bolt Thread Size M12 Idler Hole System of Measurement Metric Length through Bore 60 mm Maximum Belt Width 55 mm Outside Diameter 60 mm Overall Length 85 mm Roller Material Plastic Bearing Closure Double Shielded Bore Diameter 12 mm Compatible with Brand Rosta Compatible with Series 27 Hub Projection 8 mm Lubrication Self-Lubricating Maximum Operating Temperature 100 Degrees C