Revolutionary new fly tying bobbin that allows half hitch and whip finish knots right on the barrel of the bobbin. Tapered barrel end allows half hitch and whip finish knots to slide smoothly onto hook. Finest Surgical Stainless thread tube. O ring grip and thread keeper. Heavy Duty 2 to 16oz of tension adjustment capability. Rite Bobbins famous click drag drag adjustment. Tapered barrel end. Forms a small nozzle to easily make half hitches and whip finish. Capable of a wide range of hook sizes and all fly tying functions,dubbing hackling, parachute wings, hair spinning, you name it!