A visual aid, typically in Portable Document Format, illustrating the standardized measurements of implements used in angling for fly fishing. It presents a comparative overview of hook dimensions across different manufacturing standards, allowing anglers to select appropriate sizes for specific fly patterns and targeted fish species. For example, a chart might display the gape, shank length, and wire diameter of hooks labeled sizes 10 through 20.
Access to this resource provides several advantages. It simplifies the process of matching the correct hook size to both the artificial fly being tied and the intended prey. Consistent hook selection improves the presentation of the fly in the water, increasing the likelihood of attracting and hooking fish. Historically, such charts have evolved from simple printed guides to readily available digital files, reflecting advancements in both angling techniques and information dissemination.