Milwaukee® ShockWave™ Impact Duty™ socket, impact rated: yes, measurement system: metric, hex drive, 3/4 in drive, standard socket, 39 mm socket, 2.24 in OAL, 6 points, forged steel, black. Milwaukee® 49-66-6377 ShockWave™ Impact Duty™ Socket, 3/4 in Hex Drive, 39 mm Standard Socket, 6 Points