Common Mode Noise Filter – Coax +3 SO-239 Kit (female chassis connector + hardware) SO-239 Kit-1/2 $3.95 In stock Quantity: 1 Add to Bag Product Details Includes SO-239 chassis mount socket, solder lug, two 6-32 x 1/2" screws and nuts as shown Save this product for later Favorite Typical user comment: The filter was quite effective. Was surprised that it actually reduced the noise level more than the signal so S+N/N improved by 1.9 S units. Bill