ATP Harmonic Balancer - 102473 Part #: 102473 Line: ATP ATP Harmonic Balancer Limited Lifetime Warranty Material: Cast Iron Groove Count: 4 Hardware Included: No Belt Type: Serpentine Pulley Diameter (in): 6-5/16 Inch Pulley Diameter (mm): 160mm Degree Markings Included: Yes Number Of Bolt Holes: 2 Bore Type: Smooth Number of Integrated Pulleys: 1 Balancer Type: OE Replacement Balancer Style: Grooved New Keyway Included: No Inside Diameter Bore Size (in): 1/2 Inch Inside Diameter Bore Size (mm): 13mm Show More Show Less