Silicone circle designThe screws are equipped with black silicone rubber rings. The rubber O-ring can reduce the looseness during surfing, make the surfboard screws more stable and increase the service life of the product. Durable MaterialThe fin screw is made of high-quality stainless steel, which is not easy to rust. You can swim in the sea for a long time without worrying about damage. Easy InstallationThe installation is very simple without using other tools. It can be tightened manually in only two minutes, or the stainless steel fin screws can be easily tightened with a cross screwdriver. Strong compatibilitySuitable for the special screws of the rudder of the surfboard and fit long Board Surfboard center fins, such as long board, sup, single fin and paddleboard. Product PackagePackage include 4 sets surfboard longboard fin screws (34mm)with plastic box and give a small drawstring bag as a gift, enough for your daily use, more convenient spare. Please carefully check the size you need before buying.