Right Angled 2 Pole 1/4" Phone Plug JACK PLUG Right-angle, mono. Black shell , Silver contacts. The heavy duty professional phone plug series improves on the design of the existing C series by offering the thinnest available A-gauge 1/4" plug with unique Neutrik chuck type strain relief on the market. The slimline shell with a width of 14.5 mm meets the most recent requirements for highest density jackfields (15.88mm jack pitch).