These mounts are FireStik's most popular stainless steel mounts for flat surface applications.  Applications are, for the most part, limited only by your imagination.  Some popular applications include flat mirror arms, rails, bars, or step bumpers.  The bracket itself is about 4" (102mm) long by 1" (25mm) wide.  The supplied stainless steel mounting bolt is a hefty 3/8"-24 x 1" long and includes a stainless steel nut and washers.  This mount may be used with antennas up to 4' (1.2m) long.