ATP Harmonic Balancer - 102387 Part #: 102387 Line: ATP ATP Harmonic Balancer Limited Lifetime Warranty Material: Cast Iron Groove Count: 6 Hardware Included: No Belt Type: Serpentine Degree Markings Included: Yes Number Of Bolt Holes: 0 Bore Type: Smooth Number of Integrated Pulleys: 1 Balancer Type: OE Replacement Balancer Style: Grooved New Keyway Included: No Inside Diameter Bore Size (in): 1-1/8 Inch Inside Diameter Bore Size (mm): 28mm Show More Show Less