Mobile or Base Mounting Bracket. Accepts a SM1 or SM-1 or other type mount (not included) for your antenna (approx 1/2" Hole). Clamps around a horizontal mirror arm or other suitable rod/pipe with the antenna mounting facing upward. Overall length about 2" x 2-3/8" on the flat sides. About 1" wide and has a nice heavy thickness of about .18" thick. Between the bolts distance is about 1-3/16". These are great for use in both a mobile or base mounting option. Aluminum bracket.
Workman Electronic Products