Do you prefer Size A or Size D threads when wrapping your fishing rods? Sure, it may depend on the rod you’re building, the part of the build you’re working on, the type of thread and the application of the rod, but these 4 things remain true overall. 1: Size A thread is thinner in diameter than Size D thread. 2: When packed correctly, then epoxied, individual threads of Size A are much harder to see than Size D. This creates a much cleaner and painted on look, both on guide and decorative wraps