The Hends BL454 is designed for dry flies, featuring a thin hook and a barbless construction. It is available in sizes #8 through #20, allowing for a variety of imitations under a single model number.
The Hends chart shows a thicker hook than that of the BL474 for the four compared sizes: #10, #12, #14, and #16. For size #10, the listed diameter is 0.60 mm, compared to 0.57 mm for the BL474. This difference is a design reference; it does not replace the choice of hook shape based on the fly recipe.
Sizes #8, #10, #12, #14, #16, #18, and #20 are available in a Black Nickel finish, in packs of 25 hooks.