If the Fletchery is installed in your Hold, you can use the Fletchery as you create arrows and bolts, and gain benefits for doing so.
Any Skill Checks you make for the purpose of fletching gains a +5 bonus while you are using the Fletchery.
You fletch arrows and bolts twice as fast in the Fletchery, thanks to the workspaces and tools.
Arrows and bolts you make in a Fletchery gain a +1 accuracy bonus when you use them.