Eliminates the hassle of using a screwdriver in surfing,move a fin back or forward-out in the line up without tools. High-quality stainless steel screw and plate. Fits industry-standard center fin boxes. Thumb screw has rubber O-ring to eliminate loosening while surfing. Say goodbye to your screwdriver! Replacing your old screws with this– means never having to use a screwdriver and never again being frustrated that you forgot your screwdriver key in you car, at home or lost in the sand.