The C&F DESIGN CF-602 is a spare threader for fly fishing. This is a used item containing 4 threaders. 3 of them are unused, so thank you for your understanding. Product Name: Spare Threader Manufacturer: C&F DESIGN Model Number: CF-602 Purpose: This tool is used to easily thread tippet (fishing line) through the eye of a fly hook. It is especially useful in the evening when the eye is difficult to see, or for those with presbyopia (farsightedness). Size: Midge size Midge (Pink): Hook size #26 to #20, Tippet 8X to 7X Thank you.