ATP Harmonic Balancer - 102425 Part #: 102425 Line: ATP ATP Harmonic Balancer Limited Lifetime Warranty Material: Cast Iron Groove Count: 5, 4 Hardware Included: No Belt Type: Serpentine Pulley Diameter (in): 6-1/2 Inch Pulley Diameter (mm): 165mm Degree Markings Included: No Number Of Bolt Holes: 0 Bore Type: Smooth Number of Integrated Pulleys: 2 Balancer Type: OE Replacement Balancer Style: Grooved New Keyway Included: No Inside Diameter Bore Size (in): 1-1/16 Inch Inside Diameter Bore Size (mm): 28mm Show More Show Less