If you own a Honda or an Acura and plan on doing any major work involving the removal of the Crankcase pulley then you WILL need this adapter, at least two breaker bars, a long extension bar, 19mm socket (1/2" drive for all these) a pump jack (to lower the engine allowing the adapter to clear) and a jack stand to leverage the extension and socket coming of the bolt to the breaker bar. I picked up those up at the nearby Harbor Freight for about $12-$15 bucks a piece. Save yourself hours of frustration and buy these in advance since there is no other way of doing this without these tools. Definitely worth the money. The bolt is on there with at least 190lb torque so will will need these tools, sorry but the air guns just won't cut it.