RENZETTI HOOK RETAINER/MATERIAL CLIP – FOR TYING GAME CHANGERS & OTHER LONG STREAMERS by Andy Renzetti, Blane Chocklett and Nick Groves. Hook Retainers are designed to hold a secondary hook when tying longer flies, perfect for tying with articulated shanks and spines. It also serves as a material clip when tying smaller flies. Available in two models: (A)Fits Traveler and Presentation 4000 Series, (B)Fits Clouser Arms