Workman THGM-1 GM Trunk / Hood Mount w/ 3/8" x 24 Threaded Stud/ SO239.
These are a antenna hood/trunk groove mount. Fits a variety of GM automotive hood or trunk grooves. Constructed of high quality aluminum. Measures 2in (W) x 2-1/4in (H) with mounting flange and 3/8" X 24 Threaded stud.
Accommodates most standard stud antenna mounts.