RAM Mount Marine Electronics Mount w/Pin-Lock Security Kit [RAM-S-111U]RAM Pin Lock Security Kit and 1. 5" Diameter Ball Mount with 6. 25" X 2" Rectangle Plate The RAM S 111U consists of a 2. 5" diameter round base, STANDARD LENGTH double socket arm, 6. 25" x 2" rectangle base, RAM mixed combination Pin Lock security nut and key knob. The 6. 25" x 2" rectangle base is a universal mounting bracket with a selection of mounting hole locations. In certain applications additional holes may need to be drilled for proper fit