GREAT COMPATIBILITY: OAL 89mm, 1/2" square drive; can be used on Honda engines that use a 19mm hex pulley damper bolt or other 19mm applications. SUPERIOR QUALITY: Made with heat-treated, impact quality-GB 40CR alloy steel which has longevity longer much than other ordinary steel. PERFECT DESIGN: Provide more energy to removing the bolt for designed with more than 3 times the standard socket mass to direct. EASY INSTALLATION: Easy to install and remove, can be perfect to install to your 19mm Hex Pulley Damper Bolt with the 19 mm Harmonic Balancer Socket. .