There have been other bottle top camera mounting heads introduced in the last several years, but this is the first product in this category where the manufacturer has gotten it right. This multi-purpose unit can be mounted to a soft drink bottle with a diameter of 28.5mm to 30.5mm or to any flat surface of 3/8� or less, such as a car window. It is intended for use with compact or mini digital and photographic cameras and does carry a weight limit of 1lb. The manufacturer does not recommend use with SLR cameras that have extended lenses. Read more about this product here