The Larsen NMOK vehicle roof mount antenna installation hardware kit is a NMO mount for Motorola-style mobile antennas 0-1000 MHz. This nickel-plated stainless steel permanent mount is for a 3/4 inch hole in mounting surfaces. The Larsen mobile antenna mount includes 17 feet of RG58A/U cable and UHF male connector. Thread size is 1 1/8 inch - 18. This product ships in approximately 1 days