AHD Speaker enclosure for 1" (25.4 mm) Speakers. Fits most 1" speakers. This enclosure has two sections; Its height depends on how it is assembled.

Outside Dimensions:
One piece assembly:  1.12" x .30"  (28.9 mm x  7.8 mm)
Two piece assembly: 1.12" x  .51" (28 mm x 13 mm)