Save thousands! - Do your own timing belt Factory style. Just the 50mm head alone is $75.00 at the factory - and the bar is another $75.00 - so this is a great price on this unit. Break Loose the crank shaft pulley / harmonic balancer bolt. Designed to properly secure the pulley from rotating during R&R of crank bolt. The 50mm hex head armature slips past the tightest of spaces and slides right into the center slot on the pulley. Then slide the 2.5� foot long securing bar onto the receiving end of the armature and lock it into position with the securing bolt. Applicable: Honda and Acura models, 90+,with the above mentioned center 50mm hex slot in crank shaft pulley / harmonic balancer.