Thank you for viewing. This is a tool that easily ties the FG knot. It is a used item, but there are no noticeable scratches or stains, and it can still be used. It is convenient for tying knots easily on-site, such as on a boat. There is no original box or instruction manual. Please refer to the manufacturer's website below for usage instructions. https://www.daiichiseiko.com/pickup/index02?lang=kr Product Description Anyone can easily, reliably, and quickly tie braided knots with this assist tool! With the switch-type wavy line hook and offset arm, you can easily, reliably, and quickly connect PE line and leader with an FG knot. The body uses high-strength, ultra-lightweight, rust-resistant CFRP (carbon fiber reinforced plastic, 20% content), and the arm can be closed for compact storage when carrying. ★Size: 105 x 57 x 39mm (when stored) 58 x 149 x 39mm (when in use) ★Weight: 50g ★Material: CFRP (carbon fiber reinforced plastic, 20% content) ★Color: Carbon Black