The 11581A attenuator set contains 4 8491A attenuators with 3, 6, 10 and 20 dB in a walnut box. The connections are of type N. This set of attenuators is designed for a frequency range up to 12.4 GHz. These attenuators are ideally suited for the calibration of devices or for calibration laboratories - generally everywhere where an exact attenuation and a very precise standing wave ratio is required.