This is a reverse-prevention stopper for the Battle Field Kurodai reel. *Please refer to the image for the installation example. The stopper acts as a brake when slid outwards. It doesn't lock down completely, so you can still release line while braking, allowing for smooth tackle changes. *How to use: Place the reel body between the four nylon washers and tighten the bolt. *This is a general-purpose product made from different products and parts. *The reel body is not included in this listing. Shipping is planned via Yu-Packet Post Mini.