Peanut butter and jelly. Peanut butter and chocolate. Batman and Robin. Hulk Hogan and steroids. There are some things that naturally fit together. Planet Eclipse’s line of Geo markers and the new I.V. Core bolt are no different. Fitting the original Geo to the newest Geo marker, the phenomenal Geo 3.5, this new drive system will help you to get more shots out of your Geo marker every single time. But is it worth $169.95? Read our review to find out!