Doing some maintenance, simply need to spin on your bolts for the reel clamp or swap out a handle. Here's a hard to find must-have you should keep in your bag or on your bench. The tool pictured is one of the most useful things you can have available. Add a shorty screwdriver and you’re pretty much done when it comes to working on Penns, Avets, Newells… Super versatile. The four way wrench covers the most used nuts/bolts used in fishing reel manufacture.