V-Belt Idler Pulley, Bearing Type Ball, For Belt Type Flat, Bore Diameter 17 mm, Face Width 0.77 in, Outside Diameter 3.5 in, Pulley Material Fiberglass-Reinforced Nylon, Bearing Closure Double Sealed, Bearing Material Chrome Steel, Bearing Number 6203-2RS, Face Diameter 3 in, Face Type Crowned, Features ABEC-1 Bearing, For Belt Series Powermax, For Use With Self Adjusting Belt Tensioner, Lubrication Mobil Polyrex EM, Material Fabrication Molded, Maximum Operating Temperature 350 Degrees F