The 25-352-S 50W/8 ohm mono L pad is specially designed to be used in high power audio or speaker systems. Made of rugged high quality materials for neat appearance and smooth operation. 1/2" long threads are provided for ease in mounting in thick cabinets. Complete with knob, hardware for mounting. Specify monaural (25-352 and 25-352-S) or stereo (25-353). Shown picture is of 25-352, long shaft.