Feature 1. COMPATIBILITY: Can be used on Honda engines that use a 19mm hex pulley damper bolt or other 19mm applications. OAL 89mm, Used with 1/2” square drive. 2. HIGH STANDARD QUALITY: Made of superior heat-treated, impact quality steel, greatly dealing with high impact and absorbing some of the shock by flexing. 3. PERFECT DESIGN: Designed with more than 3 x the mass of standard impact sockets to reduce flex and vibration, delivering maximum torque and more energy to remove the bolt. 4. EASY TO INSTALL: 19mm Harmonic Balancer Socket - a must have tool to install or remove Honda 19mm damper bolts in minutes. .