FITMENT: 24mm Harmonic Balancer Socket works for GM LS engines that use a 24 mm hex pulley damper bolt or other 24 mm applications. FEATURES: 1) To remove crank bolts is a frustrating thing if the bolt is tightly fastened. You will need this crank bolt socket using an impact wrench to increase torque to help remove the stubborn crank bolt. Use with 1/2" drive. 2) Our 24mm heavy duty impact socket is designed with 3 Times Momentum Power of Standard Impact Sockets, which helps direct more energy to removing the bolt. Saving time and making the job easier. .