Milwaukee® ShockWave™ Impact Duty™ socket, impact rated: yes, measurement system: metric, hex drive, 1/2 in drive, standard socket, 22 mm socket, 1-1/2 in OAL, 6 points, forged steel, black. Milwaukee® 49-66-6254 ShockWave™ Impact Duty™ Socket, 1/2 in Hex Drive, 22 mm Standard Socket, 6 Points