The Larsen NMOKHFUD vehicle roof mount antenna installation hardware kit is a special application NMO mount for high frequency Motorola-style mobile antennas, 0 – 6000 MHz. 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. brbrThe Larsen mobile antenna mount includes 17 ft of RG-58/U dual shield cable. Order connector separately. Thread size is 1 1/8 in-18.