Tie blood knots quickly and easily. This small, lightweight, corrosion resistant, precision-made tool makes it so easy, you won’t believe it until you see it. Check out the video. Graphic and written instructions are also included. Use this handy tool to attach tippet to leader, or to build an entire tapered leader from butt to tip. Attaches to lanyard with provided ring preventing loss. Aluminum, brass and stainless construction. Made in USA. Lifetime guarantee. 1″ x 1″ x 3/8″