The Cabrinha kiteboard screws have a cross-head and they are 16mm long. These screws have been used for years for fastening bindings and fins in Cabrinha boards. You can also use these screws for bindings of other kiteboards with M6 inserts (this is the standard for 95% of all brands). Each screw has a drop of Loctite (blue) which ensures that the screws stay where they belong.