This is a homemade, infinite rigging jig. The length of the leader can be adjusted from approximately 30mm to 58mm from the hook. There is 60mm for tying. It can handle 100 knots. An instruction manual for tying is included. The length of the main line can be selected from 25cm, 27cm, 30cm, and 33cm. A leader cutter is also included. To make the U-turn pipe perpendicular to the board, I drilled holes with a drill press. I practiced tying knots with cheap size 2 bobbin thread. Please be careful not to get injured. I do not offer any warranty. Thank you for viewing.