Medium duty lip mount, 3 adjustment planes. Attach to any lip on the vehicle, vertical or horizontal, as long as the lip is no more than 1/4" thick. The mount will adjust to vertical. Recommended for antennas up to 60” tall. The RS-720NMO has a 3/4” hole to accept an NMO mount. The RS-720 has a 5/8" hole to accept an SO-239 (PO) type connector like the standard mobile cable assemblies: 3D4M, 3D5M, CK-3M, CK-3M5 The RS-730 is a similar lip mount however the footprint is larger. If you have limited space along the lip edge, the RS-720 or RS-720NMO is a better option. Footprint: 2.1" x 1.15"