ATP Harmonic Balancer - 102450 Part #: 102450 Line: ATP ATP Harmonic Balancer Limited Lifetime Warranty Material: Cast Iron Groove Count: 4, 4 Hardware Included: No Belt Type: Serpentine Pulley Diameter (in): 6-1/8 Inch Pulley Diameter (mm): 155mm Degree Markings Included: No Number Of Bolt Holes: 3 Bore Type: Smooth Number of Integrated Pulleys: 2 Balancer Type: OE Replacement Balancer Style: Grooved New Keyway Included: No Inside Diameter Bore Size (in): 1-1/2 Inch Inside Diameter Bore Size (mm): 37mm Show More Show Less