Anglers Accessories Midge Threader Fly Box w/Leaf Insert - The Midge Threader Fly Box features Micro Slit Foam with a middle leaf for extra high capacity. 3 fly threaders are included. Secure latch and water resistant gasket seal keeps flies dry. 6in x 4in x 1.61in; Micro Slit Foam; Middle leaf for extra high capacity; 3 fly threaders;