The Laird MABT8 vehicle roof mount antenna installation hardware kit is a special application NMO mount for Motorola-style mobile antennas 0-1000 MHz in thick surfaces. This brass permanent mount is for a 3/8 or 3/4 inch hole in mounting surfaces 3/16 to 1/4 an inch thick. The Laird Technologies mobile antenna mount includes 17 feet of RG58A/U cable. Connector needs to be ordered separately. Thread size is 1 1/8 inch - 18.