Slot box fin screw for counter bored M5 inserts, like those used by Starboard for the angled screws which secure the thruster fins into place.
The standard M5 x 15mm TX30 screw supplied by Starboard, is often not long enough to secure these fins propperly, especially after considerable use or for non standard fins, so a longer screw is often needed.
These screws solve the problem!
They have a Torx TX25 Pan head, so you will need a different screwdriver to the Starboard one (we often have these availabe to buy if you have not already got one)
Available as M5 x 18mm or M5 x 20mm, so they are 3 or 5mm longer than standard, securely holding all the fins we have tried.
