PEAK Rotary Vise Midge Jaws for those tiny flies - Fly Tying Peak's optional saltwater or midge jaws can replace the standard jaw in under two minutes. The midge jaw for hook sizes #16 and smaller has been designed to hold tiny midge hooks while allowing free access to the hook. The Saltwater jaw for hook sizes up to 6/0 holds large saltwater and freshwater hooks firmly. Peak recently upgraded its manufacturing process and now all jaws are black oxide coated to reduce the chances of surface rust. Chose midge or saltwater.