1 Bottle Deep = 4"
2 Bottles Deep = 8"
3 Bottles Deep = 12"
(add 1/2" to all above measurements for drywall collars)

1 Bottle Deep = 1 x 750ml or 1.5L wine bottle
2 Bottles Deep = 2 x 750ml wine bottle
3 Bottles Deep = 3 x 750ml wine bottle