V-Belt Idler Pulley Bearing Type Ball For Belt Type Flat Bore Diameter 17 mm Face Width 1.02 in Outside Diameter 5.56 in Pulley Material Fiberglass-Reinforced Nylon Bearing Closure Double Sealed Bearing Material Chrome Steel Bearing Number 6203-2RS Face Diameter 5.03 in Face Type Crowned Features ABEC-1 Bearing For Belt Series Powermax For Belt Width 7/8 in For Use With Self Adjusting Belt Tensioner Lubrication Mobil Polyrex EM Material Fabrication Molded