This individual mounting base measures 2-1/2". The base is designed to be bolted or screwed to a flat mounting surface. It has seven mounting holes. 1"-diameter.
As you would come to expect, the RAM mounting systems are rugged and very durable. The micro RAM base exhibits all the features and durability that its bigger brothers do.
I've used the Micro Ram mounting systems for years in my boat and aircraft. You can't find a more versitile, practical, or adaptable system anywhere. If this is your first time considering using a Micro Ram mounting system for your electronics... buy one, you won't be disappointed.
This works good if using the ram mounts but its very pricey for what you are getting. If you are mounting a fish finder only then I would consider a different system that is cheaper.