Place caramel halves on a plate in a single layer. Microwave the caramels for 8 seconds, just until they are pliable but still firm. With two pretzels side by side in the palm on the hand, line four caramel halves along the pretzel from one end to another. Gently pushed the caramels down using a thumb and index finger to bind the caramel to the pretzels. Repeat this with all the pretzels and caramels. Spoon the Nutella into a sandwich bag and cut the tip off. Pipe a pea sized bead of Nutella on the non caramel side of the pretzels. Carefully spread the Nutella across the top surface with the back side of a utensil handle. Place chocolate chips in a microwave safe container and microwave for 1 minute and stir until smooth. If necessary, microwave for an additional 30 seconds to get the chocolate smooth. Place the pretzel (Nutella side up) on a fork and carefully dip the pretzels in the chocolate rocking the pretzels side to side to get the pretzel bars completely coated. Lift the bar from the chocolate and allow any excess chocolate to drip off. Place bars on a plate or board lined with parchment paper. Place the board in the refrigerator for 20 minutes or the freezer for 10 minutes to help harden the chocolate coating.