High quality 12 volt accessory surface mount case housing . #CMB1
The black enclosure can be mounted over or under a surface or dashboard. Uses standard 0.250 quick connects for wire connections. Can be used with any style 12 volt plug socket accessory ( SOCKET SHOWN IS NOT INCLUDED IN THIS LISTING).
The hole opening accepts a 1-1/8" type 12 volt accessory. Up to 30mm. The dimensions are nominally 3" long x 2" wide x 2" high.