Rubber washer for fin screws. This is the perfect hole size to hold itself, and the stainless washer, in place on your M6 fin screw. So you don't lose parts when the screw is out of the board.
Rubber washer for fin screws. This is the perfect hole size to hold itself, and the stainless washer, in place on your M6 fin screw. So you don't lose parts when the screw is out of the board.