Whenever you need to put in dry verge, you'll need to put in a starter unit. These fit at the bottom of the verge, and serve as a starting point for the verge caps to ascend up towards where they meet the ridge. Without these starter units, the caps would be vulnerable to nesting insects, animals, and other threats.
These starter units are designed to work with Easy Trim's Dry Verge system. There are four colours available so you can find the one that will match your verge caps - black, brown, grey, and terracotta.