The Lisle 24mm Harmonic Balancer Socket, No. 77070, is a heavy duty impact socket designed to have more than three times the standard socket mass to help direct more energy to removing bolts. This socket can be used on GM LS engines that use a 24mm Hex pulley damper bolt or other 24mm applications such as Land Rover or Jaguar. The socket is heat treated, impact quality alloy steel, and is designed to be used with a 1/2" drive.