Features: 1. 50MM Crankshaft Pulley Removal Tool: Used to maintain the harmonic damper pulley position while removing/installing the pulley bolt on many Acura and Honda engine. 2. Using Crankshaft Pulley Removal Too: Use with square socket driver. >1/2″ square drive use with breaker bar. Hole in center of tool – allows access to removal of crank shaft bolt. 3. 19MM Harmonic Balancer Socket: It can be used on Honda engines that use a 19mm hex pulley damper bolt or other 19mm applications 4. Using Harmonic Balancer Socket: Use with 1/2″ drive. Designed with more than three times the standard socket mass to direct more energy to removing the bolt. .