The rubber clamp groove uses double rubber rings to fix the fishing line, which is more convenient to operate. It is made of rubber material, which is wear-resistant and durable. It can tighten the fishing line without damaging the line. The body is small, easy to carry, easy to operate, and can easily make a high-strength GT knot. It adopts a telescopic design, which can be adjusted freely and is easy to carry. The metal conduit is more durable and anti-fall. It has an adjustable resistance button, fine thread and non-slip design. The line delivery speed can be adjusted as needed to make the knotting more uniform. Tighten clockwise and loosen counterclockwise. The body is finely crafted, which can smoothly convey PE line, make it easier to make a high-strength GT knot, save time, and have high knotting efficiency.