The Tiemco Twin Hackle Gauge has two pins; one for standard patterns and the other for parachutes.
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To set the gauge, just slide down the stem of the fly tying vise through the hole. The hackle will not slip around the tapered pins while measuring. The hole is a little bigger than the diameter of vise stem so that the gauge will have an angle towards tyers and rotate easily while not in use. Fits onto most vise stems.