Features: 1. Application: For easy removal & Installer of most harmonic balancers and drive pulleys which are pressed fitted onto the crank shaft without damaging your vehicle. 2. Function: Fits L98 & LT series engines, GM LS1 with aftermarket 3-bolt style balancer, Also works on gear pulleys and steering wheels. A bearing-centered circular 2/3-way and an assortment of metric and fractional bolts and adapters provide wide coverage. A heavy duty, 3/4 inch diameter forcing screw is internally threaded to fit the eight adapters to install harmonic balancers.Replace with OTC 4531 .