THIS PACKAGE INCLUDES THE DRILL BASE MOUNT AND THE EXT-10 EXTENSION PLATE, WIITH A MIC HANGER ATTACHED AND A 5MM STUD ON AS SWIVEL THAT WILL THREAD INTO YOUR YAESU CONTROL HEAD. NOTHING ELSE TO BUY, NICE JOB YAESU. THIS SET UP IS DESIGNED FOR A VERTICAL INSTILLATION, BUT IT WILL WORK HORIZONTALLY AS WELL. The base can be drilled into solid, flat surfaces, such as walls, tables, and workbenches. The AMPS pattern consists of four holes located in a rectangular pattern spaced at 30.17mm x 38.05mm (measured as the center-to-center distance between holes). This tough mount is also ideal for mobile radio holders, housings, and other devices used by public safety, construction, and utility applications. This package includes only the Heavy-Duty 4-Hole AMPS Mount with 4-Hole AMPS Head. This tough, low-vibration mount measures 5.25 inches high from end to end and is made of a combination of nylon and fiber. The arm of the mount swivels on both the top and the bottom, providing 360-degree rotation and the ultimate flexibility in positioning the device at any angle.