The Fish Fighter Rail System Sliding Block is a versatile, heavy-duty mounting solution designed for anglers who demand flexibility on the water. Built from durable King Starboard Marine Plastic, this sliding block fits seamlessly onto Fish Fighter Sliding Rail System rails and allows for easy repositioning with its pull-and-twist locking knob. Its universal 4-bolt pattern is compatible with most major rod holder brands, making it an essential addition to any customizable fishing setup.Fits Fish Fighter Sliding Rail System rails4 Bolt hole pattern matches most major rod holders such as Cannon, Scotty, Folbe, Fish-On!, or AttwoodPull and twist locking knob to slide block and lock it in place easilyThe Fish Fighter Sure-Grip SRS Extreme Drink Holder is compatible, but is sold separately (FishUSA SKU #F25070)Includes mounting hardwareManufacturer's one-year warrantyMade in the USA