Description:Professional: Professional surfboard yacht accessories, special rudder screw for rudderHigh Quality: Made of 316 stainless steel, anti rust and Universal: This long plates fin screw and plates are compatible with most plates, easily to tighten the rubber ringsM5 is suitable for plastic fin, M4 is suitable for finRubber Rings: The rubber Rings can eliminate loosening during surfing, and easily tighten the screws rubber ring with handSpecification:Material: 316 stainless steelM4: 4mm/0

16inchM5: 5mm/0

20inchPackage Includes:1Pcs Pin Fasteners 1Pcs platesNote:Please allow slightly errors due to manual measurement and different monitors