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 in hole in mounting surfaces 3/16 – 1/4 in thick. brbrThe Laird Technologies mobile antenna mount includes 17 ft of RG-58A/U cable. Connector needs to be ordered separately. Thread size is 1 1/8 in-18.