The Larsen NMOHF vehicle roof mount antenna installation hardware kit is a special application NMO mount for high frequency Motorola-style mobile antennas, 0 – 6000 MHz in thick surfaces. The center pin is removable to function as a standard or high-frequency mount. This nickel, copper, and zinc alloy permanent mount are for a 3/4 in hole in mounting surfaces up to 1/2 in thick. brbrThe Larsen mobile antenna mount requires cable and connector. Thread size is 1 1/8 in-18.