This is a suction cup mount for AiM Smartycams. Fits with all AiM cams except the GP main unit. The mount uses a pivoting ball and clamp for you to setup and aim your Smartycam using almost any flat surface - glass, plastic, or metal. The suction cup itself is 83mm diameter (3.3").
Note: check with your club or organization on using a suction cup mount. Some clubs do not approve suction cup mounts.
