The threaded mount has a center hole for center wire mounting

Dimensions  3

100 – 12

Sony image sensor

Ritchie - Flush-Mount High-Speed Compasses Black & White Supersport Series, Part No SS-2000 , Black Weatherproof Cover The threaded mount has aSS1002, SS2000 and SS5000 are built to provide the ultimate in performance for high speed offshore racing boats, boats sport sportfisherman. Has high visibility blue extra light weight PowerDamp Plus dial and special Directive Force magnets. Has built in compensators and exclusive low level lighting. SS5000 has a spherical design with fiberglass reinforced bowl. SS2000 has a fiberglass reinforced, high impact, ABS case with an exclusive night lighting