These QD stud mounts are heavy-duty and ready to be attached to any antenna mount with the standard 1/2" (13mm) hole.  They are specifically designed to accept any 3/8"-24 threaded antenna up to 5' (152cm) in length.  The total height above the mounting surface is only 2.3" (58mm), or about one-half the height of using a K-1A on a standard stud mount.  With a simple push and twist motion, your antenna can be removed from your vehicle.  Model QD-4 is for use with coax cables that are finished with ring type terminals.  Both the ground and center lead connections are provided for on this mount.  The QD-4 requires just 1/2" (13mm) on the underside so it is the perfect choice for tight areas.