Features: 1. Great Compatibility: The 19mm crank bolt socket perfectly fits for Honda engines that use a 19mm hex pulley damper bolt or other 19mm applications. OAL 89mm, 1/2” square drive. 2. Made of High Standard Quality: Our 77080 harmonic balancer socket is made of heat-treated, impact-quality GB 40CR alloy steel, and its service life far exceeds that of ordinary steel. 3. Perfect Design with Harmonic Balancer Socket: Designed with more than three times the standard socket mass to direct more energy to removing the bolt. Inside hexagonal socket design, anti-skid and impact-resistant. .