NTC182-5766-0300-K0B 57 = Precision 2.4 mm male, 66 = Precision K (2.92 mm) male, 0300 = 30.0" overall length, K0B = Non-metallic, black conduit covered with PET braid. Application: Test. Operating frequency 0.05 - 40.0 GHz, VSWR 1.40:1 Max., Insertion loss 3.40 dB Max.