Package includes: 1 x harmonic balancer installation tool
No instructions included, professional installation is highly recommended.
1 year warranty.
Fitment: fits for Small And Big Block Chevy Cranks
Installation instructions: 1.Grease the interior and surfaces of the crank;2.Thread proper end of harmonic balancer into the crank;3.Screw the tool till it stops and tighten with wrench.