NOT for Standard CB/Marine Radio: This is a Mini-UHF connector (Thread diameter ~11mm). It is MUCH SMALLER than the standard UHF (PL-259/SO-239) connector found on CB or Marine radios. Please DO NOT buy this if you are looking for standard PL-259 adapters. For Legacy Motorola Compatibility: Designed for connecting modern SMA antennas or cables to older commercial mobile radios that utilize the Mini-UHF interface, such as Motorola Maxtrac, GM300, SM50, and other legacy commercial transceivers. SMA to Mini UHF RF Coax Cable Antenna Coaxial Connector Well Constructed and Connection Pins are Gold-plated for Secure Connections,Connect SMA to Mini UHF Device.Your satisfaction is guaranteed with our comprehensive 12-month post-purchase warranty and hassle-free return support. Complete Conversion Kit: Includes 4 adapters: SMA Male to Mini-UHF Male, SMA Male to Mini-UHF Female, SMA Female to Mini-UHF Male, SMA Female to Mini-UHF Female. Package Included: SMA to Mini UHF Antenna Adapter Kits (mini UHF Male to SMA Male connector Included, mini UHF Male to SMA Female connector Included, mini UHF Female to SMA Male connector Included, mini UHF Female to SMA Female connector Included) Impedanec:50ohm; Temp.range:-65~ +165 (PE Cable -~ +85); Nickel-Plated Machined Brass Construction,Gold-Plated Contacts – Teflon Insulator.