V-Belt Idler Pulley Bearing Type Ball For V-Belt Type Classical Bore Diameter 17 mm Face Width 0.7 in For Belt Trade Size A Outside Diameter 3 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 RT1001 RT3001 Features ABEC-1 Bearing For Use With Self Adjusting Belt Tensioner Material Fabrication Molded Material Grade 6/6