This ToolPRO 13 Piece Harmonic Balancer Puller Set comes with everything needed to pull any harmonic balancer off an engine. Included in the kit are several different sized bolts to suit a variety of balancers, the centre shaft which is made from high strength alloy steel, vibration dampers and of course the puller itself which is designed to be suitable for both 2 and 3 bolt applications with different bolt spacing. When it comes to a complete overhaul with an automotive engine, eventually the harmonic balancer has to be removed which can be a troublesome task, and potentially damaging, if the right tool is not used. The function of a universal harmonic balancer puller is to line up with either the two or three bolt holes on the front of the balancer, which varies across different engines. Using the correct size bolts to thread into the holes and hold the puller in place, the centre shaft is then threaded through the centre of the puller to brace against the loosened centre bolt that normally holds the balancer in place. The tightening of the pullers centre shaft then safely slips the harmonic balancer off the shaft.