Diamond - DMD35 - 3.5"/87mm Full-Range 20W

3.5 inch Full-Range speaker
20W RMS 3.5
4 inch Square Adaptor, 3.5 inch “Triangle”
Adaptor for BMW, and a Universal 4 inch X 6 inch
Adaptor are included for Easy Installation
Mounting Diameter: 2.81 inches / 71.5mm
Mounting Depth: 1.56 inches / 39.5mm