Genuine GM part Fits all '92 - 2005 GM 3800 supercharged engines

• Width: 1.2" (30.5mm)
• Material: Steel
• Bearing Inside Diameter: 0.7" (17mm)
• Outside Diameter: 3.5" (90mm)

Commonly used as an oversize tension idler pulley where the larger size enables use of stock length belts when running smaller supercharger pulleys.