V-Belt Idler Pulley, Bearing Type Ball, For V-Belt Type Classical, Bore Diameter 17 mm, Face Width 0.8 in, For Belt Trade Size B, Outside Diameter 5 in, Pulley Material Fiberglass-Reinforced Nylon, Bearing Material Chrome Steel, Bearing Number 6203-2RS, Compatible Tightener Shaft Grainger Part Number 33Z811, Compatible Tightener Shaft Manufacturer Part Number RT3001, Features ABEC-1 Bearing, For Use With Self Adjusting Belt Tensioner, Material Fabrication Molded, Material Grade 6/6