Application: Can be used on engines that use a 17mm hex pulley damper bolt or other 17mm applications.OAL 89mm, Used with 1/2” square drive. PERFECT DESIGN: Our 17mm heavy duty impact socket designed with more than 3 times the standard socket mass to direct.which helps direct more energy to removing the bolt. Saving time and making the job easier. EASY TO INSTALL: 17mm Harmonic Balancer Socket – a must have tool to install or remove 17mm damper bolts in a minute. 6-point socket design helps lock the crank bolts more firmly, reduces wear and prevent rounding at the corners. .